T-Mobile: First US network to comply with FCC’s STIR/SHAKEN protocol deadline


For years now, US carriers have been doing their best to protect their customers against scam callers. It has gotten so bad that the government has even implemented rules against it and encouraged carriers to take the concern seriously. As their response, companies have rolled out their own security measures to safeguard their customers against these callers. The latest to take action is T-Mobile with its Scam Shield protection. 

And today, T-Mobile revealed that they are the first US carrier to work with the other major networks to implement STIR/SHAKEN protocols as a way of fighting number spoofing. The Un-Carrier has started working with Charter Communications’ Spectrum Voice, making them the first US carrier to partner with all major networks in the country to deliver number verification to customers. With the partnership, T-Mobile is able to authenticate calls from various network providers in the country. 

Apart from Spectrum Voice, T-Mobile has partnered with AT&T, Comcast, Verizon Wireless, UScellular, Altice USA, Clear Rate, Google Fi, Bandwidth, Brightlink, Intrado, Inteliquent, Twilio, Peerless, and Magicjack. By partnering with these companies, T-Mobile has fully adhered to the Federal Communications Commission (FCC)’s June 2021 deadline to implement the protocols throughout the industry.  

Mike Sievert, T-Mobile CEO says:

“T-Mobile was first to implement number verification in 2019 because protecting customers against scammers and spammers is one of the most important things we can do as an industry. To date, T-Mobile has protected over 80 million customers from more than 33 billion suspect calls — and counting. With the combination of Number Verification, free Caller ID and the scam blocking tools in Scam Shield, and by working with network providers of all sizes, we are providing the industry’s most comprehensive scam and spam protection for free to all our customers and working every day to make scammers jobs impossible.”

T-Mobile launched Scam Shield last summer as a comprehensive set of tools designed to protect its customers against robocalls and scams. Through this, both T-Mobile and Metro by T-Mobile customers get automatic and free scam call warnings, the ability to block scam calls completely with Scam Block, and free Caller ID. It is free to use by all T-Mobile and Metro by T-Mobile customers. Ever since the tool was launched, T-Mobile’s network has been 30% better at detecting scam calls.


Source: T-Mobile

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  • Shaun Michalak

    It makes me wonder how many of the bugs that they worked out.. When this first came out, I had to have it turned off on my phone because when my mom called me, under the same plan, she was getting blocked by it, and could not reach me.. Legit calls being forwarded to me from my home VOIP service were getting blocked too..

    • dcmanryan

      I had the same experience and the only fix was adding every contact to favorites. The problem with that is you always forget a few people and we all have people not in our contacts. I did the same and just turned it off and if I don’t recognize the number I don’t answer it and I still often get calls that say spam likely even with it turned off so I don’t see the point to ever turn it on again.

      • It’s far better now than it used to be. It’s a lot less aggressive, especially now that SHAKEN/STIR is fully implemented across the major carriers. If the caller is verified with the SHAKEN/STIR protocol, it passes.

      • Shaun Michalak

        If it was just because of contacts, that would be easy to work with.. My problem is, if they are going to block a cell phone call from another T-Mobile line on the same plan, what happens when doctors offices and stuff start calling, and you do not have those in your list?? I am afraid that calls like those might have been getting blocked too..

        The only problem I have with the “scam likely” listing that they give.. The number is either in your list, or it says scam likely.. Heck, it could be social security calling you back and it would say scam likely.. They need a better way of registering that numbers that are legit, from legit companies, come up as something other then “scam likely” as the only real alternative..

  • Just_Joe

    Apparently, though, the majority of scam [robo]calls come from outside the US. Inside the US the phone network infrastructure and agreements have translated call volume into profit for the phone companies, so they’ve really had underwhelming incentive to deal with the problem. Given the typical–though not limited to–smartphone user’s ability to call any other user without going through the PSTN at all, I’ve got to wonder why we bother to use it so much at all anymore. My standard “phone [number]” setup would be “leave a message and I’ll get back to you… maybe [if you’re not a scammer]” (oh well)–sort of a perpetual Do Not Disturb.

  • disqus_2AG4Cmg523

    Now lets get cross carrier HD voice. Sounds like they have it with ATT. But not Verizon.

  • rene

    so how i feel the take advantage of some loop hole that given access to the most called number from your phone, is my case, people receiving call from me, that are not from me but scammer, spoof ?same happen to me from my friend and I get spoof too , so some how the have access to people call listed too and that only happen if that list is sold too by our lovely carriers, so spoofing and car warranty irs scam and some other keep their flow same as 1 year ago, free scamshield, please you have to paid for that, is not free, free is just the basic, same as nothing.