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How to Prevent Spam Callers From Leaving Voicemail

by Josh Kirschner on September 15, 2023

Updated on 9/15/2023 with the latest instructions for blocking spam calls for Android and iOS, the best spam-blocking apps, and pricing for spam-blocking services.

Blocking of spam callers has gotten better, with all major carriers implementing STIR/SHAKEN (more on that below) and other methods of preventing spam call before they ever ring on your phone. But even with the newest technologies, it's clear from comments from our readers and my own experience that plenty of spam callers are still getting through. And if you don't answer those calls, they'll fill up your mailbox with sketchy messages about your car warranty or vacation club offers.

Smartphone showing an alert that the incoming call is a scam.

Unfortunately, preventing spam callers from leaving a voicemail on your cell phone can be tricky. I've researched the options from each carrier and tested a number of call-blocking apps to see what really works. Here are the best solutions I've found for blocking spam calls and voicemails directly through your phone, via your carrier, or a third-party app, and the features and limitations of each method.

Blocking Calls on iPhones (but not voicemail)

Direct blocking

On iPhones running iOS 8 or higher, go to the Recent Calls tab in the Phone app, and tap the “i” icon at the right of the number that you want to block. If the number is in your Contacts list, open that contact’s page in the Contacts app. From the contact page for the caller or contact, scroll to the bottom of the page and tap Block This Caller.

But this method has two drawbacks. First, someone has to call you in order to block the number. And since spammers rarely use the same number or use the “neighborhood spoofing” technique (where they use your area code and three-number prefix), this won’t block the majority of spam calls you get. Second, those blocked calls still go to voicemail, though these voicemails show up in a "Blocked Messages" folder at the bottom of your list of voicemails and you won't get a notification.

Silence unknown callers

You can also choose to silence unknown callers – anyone who is not listed in your iPhone's Contacts. Your iPhone won't ring, but the calls will show up in recent calls, and you'll see voicemail in your regular voicemail inbox.

Blocking Calls on Android Phones (and voicemail on Pixel)

Built-in call blocking

Android has built-in call blocking, similar to iOS. Just tap a number in your call log and hit Block/report spam. And like Apple, this method has the two same drawbacks – the spammer has to call you first, and blocked callers still go to voicemail.

Android also has the option in the Phone app settings to automatically identify and block suspected spam calls so they don’t ring your device. It should be on by default, but you can check by going to "Settings" in your Phone app, then "Caller ID & spam," and make sure "See caller and spam ID" is toggled on. If you have a Samsung phone, go to your Phone app, open "Settings," and make sure "Caller ID and spam protection" is toggled on.

Voicemail blocking on Pixel

If you have a Google Pixel phone, you can choose to have Google Assistant answer a suspected spam call and transcribe the conversation in real-time, so you can decide if you want to answer the call or hang up. And since Google Assistant already picked up the call, hanging up won’t send it to voicemail. To turn it on, go to "Settings" in your Phone app, then "Spam and Call Screen," and make sure the " See caller & spam ID" is toggled on. Tap "Call Screen." Under “Unknown call settings,” tap the types of callers you’d like to screen "Spam," "Possibly faked numbers," "First-time callers," and "Private or hidden." To screen calls automatically, choose "Automatically screen. Decline robocalls."

Setting a default spam app

Note: You need a default Caller ID and spam app selected for spam call blocking to work. Go to the main Settings app and then select "App" and "Default apps." Select "Caller ID & spam app," and select an app.

Spam Blocking Apps for Android & iOS

There are dozens of apps in the Apple App Store and Google Play that are labeled as call blockers. But you have to be very careful about which you install – you’re giving them full access to your phone, texts, contacts, and more, meaning there’s a lot of potential for misuse. And each of those apps will only perform as well as the technology (and the blacklist) running it. Also, while these apps will block calls, because of restrictions placed on apps by the Android and iOS operating systems, most won't stop those calls from going to voicemail.

App recommendations

The Call Control app for Android will actually block robocalls from leaving voicemail. Calls on your blocklist, neighborhood spoofing calls, and calls identified by Call Control's community blocking are simply dropped – no ring, no mailbox filling up with crap you have to delete. At $29.99 per year, it's not cheap, but that's in line with other major call blockers, such as Robokiller, Hiya, or Truecaller, that don't offer voicemail-blocking capabilities. Call Control has a free offering that blocks neighborhood spoofing numbers but not numbers on the community blocklist; if most of the calls you receive are of that variety, you can get away with this option.

Unfortunately, Call Control for iOS doesn't offer voicemail blocking because of limitations Apple puts on iOS device access, so you're probably better off with Robokiller, Hiya or Truecaller, who have larger community blocking lists. Personally, I prefer Hiya, which white-labels its technology to Samsung, AT&T, and others, has an extensive community-driven blacklist, allows you to block neighborhood spoofing calls, and even provides caller ID features that you would usually have to pay for with your carrier.

App pricing

Call Control, Hiya, Robokiller, and Truecaller have various pricing models, generally offering monthly or annual subscriptions. Pricing for the services as of the date of this article is as follows: Call Control is $3.33 per month or $29.99 per year; Hiya is $3.99 per month or $24.99 per year; Robokiller is $4.99 per month or $39.99 per year; and Truecaller is $4.49 per month or $29.99 per year.

Blocking via Google Voice

Google Voice provides another way to block pesky spam calls and prevent them from going to voicemail. The trick is you need to switch to Google Voice as your main number and stop giving out your old carrier number. With Voice, you can block known spam calls in three ways: by sending calls to voicemail, by treating the call as spam (letting the caller leave voicemail but tagging it as spam), or by call blocking (in which case the caller will hear a “Number not in service” message and will not be able to leave voice mail).

Drawbacks

The big drawback here is that your Google Voice number now becomes your main number, which you forward to the number from your carrier, and you need to use the Google Voice app as the main calling app on your phone. And there’s still no guarantee that spam callers won’t call your carrier number directly, either because it’s already out there (learn how telemarketers get your number) or simply because the robodialers are going through every number combination.

Carrier-level blocking

Truly effective call blocking and voicemail prevention need to be at the carrier level – it’s the carriers who have the technical capability to identify call origination sources and create services that prevent spam and blocked calls from going to voicemail (since they’re the ones that control the voicemail service). Under the TRACED Act, carriers can block suspected spam calls before they reach your device.

STIR/SHAKEN technology

The FCC has also been working with carriers for years to deploy a technology called STIR/SHAKEN, which authenticates calls. When a call originates, the caller ID is "signed" as legitimate and is validated each step of the way, as it moves from network to network, before reaching you. The major carriers have implemented STIR/SHAKEN and show when a number has been verified. This can show up as a "verified number," "caller verified," or "valid number." On iPhones running iOS 13 or higher, you'll see a checkmark under calls in your Recent Calls list that have been verified. Right now, the lack of these verification labels doesn't mean that the number is spoofed. It just means that numbers with the tag have been successfully validated all the way through the call routing, and you know the number isn't spoofed.

This year, the FCC took additional steps to curb spam calls by requiring gateway providers, those that provide access from overseas callers to U.S. networks, to implement STIR/SHAKEN. And the FCC has expanded carrier obligations to curb spam calls.

Even with these protections, spam calls are getting through. So all the major carriers offer various flavors of spam blocking services, some free and some which you have the privilege of paying extra for.

Call blocking on AT&T

At a basic level, AT&T postpaid customers can activate AT&T’s free ActiveArmor service on their accounts with the ActiveArmor app. ActiveArmor will block known spam calls entirely, preventing them from leaving a voicemail and letting you block specific numbers. You'll also see "Valid Number" if the call has been verified.

If you want more features, you can upgrade to Call ActiveArmor Advanced for $3.99 a month. ActiveArmor Advanced users can block categories of calls, including private callers, political calls, telemarketers, account services, and general spam. You can choose to have these calls go to voicemail or be blocked entirely. And you can do a reverse number lookup to see who's calling. In addition, ActiveArmor Advanced includes Caller ID and a VPN.

Call blocking on T-Mobile

T-Mobile customers can download and use the free Scam Shield app to be notified when scam calls come in. You can also turn on T-Mobile's scam blocking by dialing #662# and pressing the call button. You'll also see "Caller Verified" in the information about the call if the call has been verified.

For $4 a month, Scam Shield Premium lets you block "spam likely" calls before they reach your phone, see Caller ID for people not in your contacts, and send categories of calls, like telemarketing calls, survey calls, political calls, and charity calls, straight to voicemail. And, you can do a reverse number lookup to see who's calling.

Call blocking on Verizon

Verizon's Call Filter service offers spam blocking for free. You'll get a warning of incoming likely spam and can send those calls to voicemail. With the app, you can block spam calls by risk level (either send to voicemail or hang up), report calls to improve Verizon's community blocking list, and add neighborhood spoofing protection. For $3.99, you can get Call Filter Plus, which offers more advanced caller ID, including viewing incoming-call risk level, and reverse number lookup features.

Conclusion

While the combination of carrier-level services, phone settings, and third-party apps offers a comprehensive defense against these unwanted interruptions, no method is foolproof. Understanding how telemarketers obtain your number and taking steps to protect it remain crucial in preventing spam calls.

[Image credit: scam call via BigStockPhoto]

Josh Kirschner is the co-founder of Techlicious and has been covering consumer tech for more than a decade. Josh started his first company while still in college, a consumer electronics retailer focused on students. His writing has been featured in Today.com, NBC News and Time.


Topics

Privacy, News, Phones and Mobile, Blog


Discussion loading

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From Scott on April 10, 2017 :: 3:51 pm


Like the subject line says, unless you’re using an older version of Android, the “pick up and hang up” function of all call blockers no longer works. Guess who you can thank? Google! I guess the telemarketers and bill collectors got to them?

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From Betty on March 12, 2020 :: 11:39 am


Yeah that sounds about right. We used to be able to trust Google with no exceptions and now…???

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From Charles on August 04, 2017 :: 4:43 pm


Download AT&T Call Protect - it will send calls to a busy signal. Just called the carrier and they directed me toward the app. It’s free and works perfectly.

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From Marie B-Mollison on August 05, 2017 :: 5:36 am


So does it not send block calls to vm? Just rejects them? Thx

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From Charles on August 05, 2017 :: 5:52 pm


Yes. It automatically hangs up on the person. I did a trial with my work cell phone it automatically disconnects.

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From Stop Robocalls on October 11, 2017 :: 1:25 am


Hey,
  I agreed that robocalls or ex’s calls are really annoying for you any your family. Thanks for this great blog, I appreciate your efforts. This is very helpful for everyone who want to get relief from these types of calls. I know some of apps like truecaller, hiya and so on..

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From Mike Volpone on November 21, 2017 :: 5:46 pm


I keep getting messages on my iPhone 6 where the person asks if I’m ready to borrow that money we discussed (never happened). Their phone number shows but when I go to my incoming or missed call log to block their number, there is nothing there…

Anybody know what to do??

Thanks in advance,

Mike

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From Mansi on July 09, 2018 :: 2:19 pm


I have had a certain number blocked on my iPhone 7 and that worked but it gathers them at the bottom of all your regular voicemails under the title “ blocked calls” but the person was able to leave a message.  Now that person learned to block their number * 67 and the call shows up as “ unknown caller” .  They are able to leave a voicemail with your other voicemails that shows up as “ unknown”.  I have not figured out how to stop it.

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From Kimberly Mahaffey on September 27, 2018 :: 10:47 am


If you have AT&T then you can upgrade your Call Protect (which is free) to the Call Protect Plus at $3.99/mo. I believe. With Plus you will have the option to allow calls to go to VM or not.

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From Josh Kirschner on October 16, 2018 :: 11:11 am


We’ve updated the story and Call Protect is now listed as one of the options (one of the only options that actually blocks calls from going to voicemail).

Best,
Josh

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From Toad Hall on October 10, 2018 :: 7:21 pm


“learn how they get your cell phone number — and then don’t let them have it. “

Damned stupid suggestion. I have never given my number to anyone except immediate family. The spammers just call every number one after the other until they find a live phone

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From Maria on November 01, 2018 :: 11:24 am


I have call blocking, on my phone and on my voice mail.

There are some spam calls that don’t show up on my phone or incoming phone call list.  These numbers do show up on the voice mail I use, but even though I block them, they still come through.  I have to manually block them for some reason instead of just doing the “block number” bit by hitting the “block number” feature.

No matter HOW I block these numbers, they STILL get through, but they DO NOT show up on my ID caller screen.

There is also a scam robo caller with a prerecorded message that even gives a phone number.  (yes it IS a scam, I’ve done my research)  And no matter what I do, even though the number shows up on both the phone and the voice mail, it keeps coming through.

I keep having to change my phone number to escape these psycho calls, but they end up finding my phone number again.

And putting my phone number on the Do Not Call Registry doesn’t do any good.

Even filing complaints on these scammers and their numbers to the FCC doesn’t do any good.

There’s got to be a program that can deal with scam numbers.  For example:  If the phone number isn’t listed with a name and address online or in any online phone book, it doesn’t allow the call to get through if it’s on your list.

There’s got to be a solution for this somewhere.

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From Debbie on November 10, 2018 :: 6:25 pm


Had the same issue ... blocked calls kept getting through to VM. I found out from my carrier, Freedom Mobile (formerly Wind Mobile) last year that ‘Call Forwarding’(CF) is the default setting on mobile phones. They explained that CF is UNCONDITIONAL; meaning regardless of blocked or not, all incoming, unanswered, calls to to VM. Blocked call features on phones, while CF is activated only block the phone from ringing, but the caller has no idea, as the ring is just turned off.

When my phone had to be factory reset during repair, the issue re-occurred because it reset to defaults.

Contact your provider and determine how to turn off CF and your phone will utilize the blocked feature as intended without UNCONDITIONAL CF.

It may be the same on all android, or just for Freedom mobile, but here is how I turn mine off, as an example:

To disable CF: dial ##21#
To enable CF:  dial *21##
To disable CF for specific numbers:  dial*21*phonenumber#

As I say, worth a try or a call to your carrier. Problem with the apps to do this is security.

Cheers!
Debbie

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From Josh Kirschner on November 12, 2018 :: 7:23 pm


Shutting off call forwarding may prevent calls from going to voicemail, but it will prevent ALL calls from going to voicemail, not just spam calls.

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From Debbie on November 14, 2018 :: 9:03 pm


Best I can explain based on the technical support I received, call forward activation is unconditional call forward. Conditional voicemail is already in place as long as your plan comes with voicemail. Blocking a caller is a condition of voicemail in normal voice mail mode. As I said, it works for me when I originally did it and when my phone was reset to factory settings. No harm in trying it, is all I’m saying. Disable Unconditional Voicemail and perhaps call yourself from a landline to see if you go to your voicemail. Unless you’ve blocked your own number, it should. Can also try blocking and unblocking your own number, once you’re disabled it, to see the difference. If it doesn’t work, turn your Unconditional Voicemail back on, and you’re back where you started.

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From Cindy on February 24, 2019 :: 1:30 pm


I just tried this (entering the code to prevent specific numbers from forwarding), and instead, it forwarded ALL my calls TO the number I was trying to prevent from being forwarded.

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From Alise on November 26, 2018 :: 7:32 am


Now there are three ways to stop spam. The first is to use native iOS and Android blocking functions. The second is to use third-party spam blocking apps and the third- not use a mobile phone. Actually, we can’t stop using our phones as they offer us so many abilities every day. Native OS functions are not always effective, so spam blocking apps is what we really need. When I understood this, I installed CallHound app https://itunes.apple.com/app/id1293775392, created some filtering rules there and switched on the option for blocking calls from short numbers. Now, this app helps me a lot to block unwanted calls, so I can highly recommend it.

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From Oz Hog on November 30, 2018 :: 6:47 pm


If I didn’t get spam calls I wouldn’t get any calls at all!

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From Sara Andersen on February 04, 2019 :: 5:52 pm


Hey-I bet the government DNC list actually harvests our numbers for these scam callers. I added my number on the DNC list a long time ago. That was my home number, it worked well for several years, or so I thought. What seems like is happening now, especially since I added my recently-changed cell phone number on the DNC list, is that I have a lot more telemarketing calls. I probably get 14 to 18 a day & sometimes as many as 20. Positive it will get worse. This is becoming a joke. Service carriers CAN & SHOULD use their tech to block these.

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From Rhonda Bormann on February 13, 2019 :: 2:39 pm


Has anyone discovered a way for spam callers which you may have blocked to then leave a voicemail with nothing in the voicemail.  It gets annoying to have to listen and delete these voicemails.

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From Josh Kirschner on February 13, 2019 :: 5:08 pm


The recommendations in the article are pretty up to date. Unfortunately, your options for blocking spammers from voicemail are still pretty limited. However, one thing I did which helps was to turn on Visual Voicemail in my Android phone settings. Visual Voicemail makes it much faster to screen my voicemail messages and delete those that are spam or empty.

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From Mike B on May 05, 2022 :: 3:06 pm


I like Visual Voicemail and Visual Screenining to cut down scam calls that I happen to have my phone on me 95% of the time thereis two in the history but 20 voicemails snuck through with no number or nothing just a bunch of blah blah scams the feds and social security just say keep reporting them

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From Judy Darr on April 26, 2019 :: 5:30 pm


Yes, me too!! We need help!!

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From Marsha Jones on March 12, 2019 :: 11:55 pm


On You Tube, there are some fellas who get them to stop calling by answering and then -well, they have several different ways-all of them humorous- that makes the caller hang up!It’s clever and hilarious. Please listen. I did it and started my day w/ a smile when I used one of their methods.

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From Josh Kirschner on March 13, 2019 :: 4:08 pm


If your goal is to stop robocallers, do not engage with the call or callers. Doing so confirms your number is valid, which could lead to more calls.

On the other hand, if you just want to waste their time and have some fun…

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From John on May 23, 2019 :: 7:46 pm


Figured I would put a list of scammers that called me and a couple of my friends. That way robots could pick them up and call them.
843-485-xxxx

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From Josh Kirschner on May 24, 2019 :: 8:09 am


Spammers spoof numbers. Posting a list of numbers from spam calls is likely just posting a list of completely innocent people. We’ve removed the numbers from your post.

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From P. D. Mahoney on July 16, 2019 :: 3:15 pm


Hey, Josh.  I stumbled upon a combo fix for my iPhone that seems to be working well.  Our carrier is Verizon Wireless.  I use the free version of their Call Filter app and also subscribe to the NoMoRobo app. Both apps are enabled in Settings and, yes, both have access to my contacts.  I had been using Nomorobo for about a year, but spam was still getting through on an almost daily basis, albeit much less than when I had no filters.  Adding Call Filter to the mix changed the game.  Legitimate calls come through without a hitch, and peace otherwise reigns supreme. For the time being, I view providing access to my contacts as a practical compromise given the onslaught of spam I used to get. But that has to be monitored.  Sharing FWIW.

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From Lynn Brooks on July 18, 2019 :: 7:28 pm


I have an iPhone 7.  When the phone rings either gives the phone number or not, I use the message option to answer.  I created 2 messages of my own.  The first one says “no ID, no answer”.  The second one says “STOP”.  This sends the calls to voice mail which I can then block later on.  I also rechecked that my phone number is still on the Do Not Call list and it is.  From information provided by the Do Not Call folks, they inform you that once you tell a caller to remove you from the list or reply STOP, they can no longer legally call you.  It takes some work, but I am finally getting fewer calls!  And I did it all by myself :o)

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From Jim Brown on July 26, 2019 :: 1:27 pm


I just bought a new Samsung phone and it does not have these options under the phone settings.

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From Josh Kirschner on July 29, 2019 :: 12:04 pm


Samsung has its own calling/spam blocking system based on Hiya’s tech. You can read more about it here: https://www.samsung.com/global/galaxy/apps/smart-call/.

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From Dana W. on September 08, 2019 :: 2:06 pm


Read the article then went to the settings on my Android phone.  Unfortunately settings doesn’t have either Caller ID or Spam options. 

I have a 3 yr old Motorola Moto G5 Plus phone so it isn’t super expensive but not super cheap either.

Current plan is with Ultra Mobile a division of T-mobile which is quite cheap.  I pay about $24/month (taxes incl) for unlimited talk and text and 3 GIG of data which is plenty for me.  There are other price options.

Can only hope the government and carriers will really do something about spammers and robocallers.  Aside from the nuisance factor many people believe them and get scammed out of money.

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From Rick Thompson on September 21, 2020 :: 2:10 pm


Don’t use Call Control if you care about privacy and not being tracked. For one, you have to give the app access to literally everything on your phone. Secondly, there are 11 trackers built into it. It has a privacy rating of ZERO from Exodus Privacy Analyses.

Want to know what I did? I let my mailbox fill up and I leave it that way. I just don’t really care. Everyone I know knows that they have to text me to get me a message and everyone else… like I said, I don’t really care.

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From Josh Kirschner on September 21, 2020 :: 9:39 pm


All of the call blocking apps - Hiya, Truecaller and, yes, Call Control - need those permissions to perform the functions of managing your phone and messages, among other features. That’s why it’s important to understand who is producing the app and only use those you trust. Hiya and Truecaller are well-known, highly regarded apps. I spoke directly with the developers of Call Control (based in Seattle) when I originally reviewed the app. and you can read more about their privacy in my review.

As Call Control is ad supported for the free version, there are ad trackers, as there are in any ad supported app.

If either of the above things concern you, you certainly don’t need to download Call Control or any other app. Though for many people, giving up on voicemail entirely isn’t a viable solution.

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From Herkie on October 20, 2020 :: 10:44 am


This is old and useless advice, I get spam robocalls mostly in Spanish that leave voicemails but without there being a ringtone nor a number from an incoming call in my inbox that I can open with my Android to block.  They can call anytime 24/7 and I can’t block them because they do not show up in my call log. 

As scammers and spammers get more sophisticated it would appear the only solution will be to adopt laws that prohibit telephone solisitation entirely.  Which SHOULD have been done decades ago.  I would prefer a law that requires prison time, confiscatory fines, and extreme ease of use for the party being spammed. 

The do not call list never EVER worked, no efforts were put into enforcement.  I think about 6 months after the law was passed the goverenment stopped even checking it.  It was itself just a scam to make people feel like government was helping them out.  It wasn’t.

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From Old School about some things on March 08, 2021 :: 1:25 pm


I will not enable VM (or power-ON keycode).
What else should I not start?

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From stephen mehl on July 16, 2021 :: 1:15 pm


Thanks for the comments.
Most recent on top would be more relevant.

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From Denise on July 25, 2021 :: 1:45 am


Should I Answer? for Android works the best.  You can choose pickup and hangup for spam scam calls.  They can not get to your VM, it just hangs up on them.

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From An Abused Woman on November 01, 2021 :: 9:55 pm


I have been harrassed for 7 years now by a former boyfriend.  He is blocked but is still able to leave a message 10 times a day inspite of the protective order.  I have a Tmobile phone.. how do I stop the harrassing voicemails?

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From Josh Kirschner on November 02, 2021 :: 10:56 am


The best option is to use a call blocking app like Call Control (mentioned above) that will answer blocked numbers and hang up, preventing them from going to voice mail.

But the app solution will only go so far - it would be easy for him to change his number and continue to harass you. Given the protective order, it sounds like this is an issue that should be resolved through the legal route by notifying the court of his violations. This is a discussion to have with your attorney.

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From Danley B Wolfe on December 28, 2021 :: 4:27 pm


I use Hiya and generally happy with .. I block incoming calls by area code ... around 230 area codes currently blocked. Unfortunately I can’t
practically block my area codes and the area codes surrounding my a rea code (central Ohio) or it would interfere with my daily life etc.  If an area code is blocked the call cannot be connected and if the call cannot be connected they cannot leave a voice mail.

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From Jeff K on June 26, 2022 :: 8:44 pm


I change phones and plans so frequently that I no longer use the phone number that comes with my smart phone.  I just got a Google Voice number that I use for everything and forward calls to whatever phone I am using.  I got a call blocker app on my phone that has a “whitelist” option which only allows my Google Voice number to ring through on my phone.  All other calls are immediately sent to my smart phones voicemail which I purposely leave full all the time so that voicemail just tells them my voicemail box is full and then hangs up on them.  They don’t get to leave any annoying messages for me.  I never hear them call me and I never hear any messages from them.  All important calls ring through on my Google Voice number and if for some reason I can’t answer that call it goes to my Google Voice voicemail box and they can leave a message for me which is then transcribed into text and sent as a text message to my smart phone.

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From Ronald B on December 18, 2023 :: 11:36 am


I have/use a landline old Sony phone thru AT&T VoIP.  Phone has a digital answering machine function.  I receive many spam calls.  The calls ring the phone, show up on the caller ID, but for MOST of the calls, the ans. mach. function does NOT RECORD the call - hence hanging up on the call. Is there a TYPE OF phone call ‘besides’ Robo calls;  where one type is recorded / the other type not? [alternately because of the Robo technology, are all Robo calls not answered/recorded by ans. machines but do go to Vm?]  {nothing about this comes up when I google the subject}.  Hope YOU can answer this!

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From Josh Kirschner on December 19, 2023 :: 9:25 am


I’m not aware of any technology on Sony VoIP phones that would block spam calls as part of the answering machine function. More likely, the robocalls are automatically disconnecting when they detect an answering machine since they can’t work their scam magic by leaving a message.

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