T-Mobile is fighting back against scam calls with 100% STIR/SHAKEN compliance

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T-Mobile storefront (Image credit: Android Central)

What you need to know

  • Calls originating on the T-Mobile network are 100% STIR/SHAKEN compliant.
  • T-Mobile has implemented STIR/SHAKEN with 15 other carriers.
  • STIR/SHAKEN works with T-Mobile's Caller ID to make sure the displayed number is accurate.

T-Mobile announced (opens in new tab) that it has filed a certification of completion of the STIR/SHAKEN implementation in the FCC's Robocall Mitigation Database. With this, calls originating on the T-Mobile network are 100% STIR/SHAKEN compliant.

Scam and spam calls can often come from a number that looks familiar or spoofs another trusted number, so a traditional caller ID may not be effective against these calls. STIR/SHAKEN works to verify that a call is coming from the claimed source.

John Freier, Executive Vice President of T-Mobile Consumer Group, said:

Number Verification, along with Caller ID, and the scam identification and blocking tools in Scam Shield, gives our customers the industry's most comprehensive free scam and spam protection.We were first to implement number verification in 2019 and today, all calls originating on the T-Mobile network are 100% STIR/SHAKEN compliant, giving our customers peace of mind that their calls are protected against scammers and spammers.

STIR/SHAKEN (Secure Telephone Identity Revisited and Signature-based Handling of Asserted Information Using toKENs) is a method of verifying that phone calls made over IP are actually coming from the proper origin by having the caller ID signed by the originating carrier. Calls made over IP are routed over an internet protocol and are required by the FCC for STIR/SHAKEN. This method is now being used by every major carrier, including T-Mobile, as it increases its reliance on 5G coverage, which uses IP for calls.

T-Mobile has implemented this feature with AT&T, Comcast, Spectrum Voice by Charter Communications, UScellular, Verizon Wireless, Altice USA, Bandwidth, Brightlink, Clear Rate, Google Fi, Inteliquent, Intrado, Magicjack, Peerless, and Twilio.

STIR/SHAKEN is just one part of T-Mobile's plan to combat scam calls alongside its Scam Shield product. Scam Shield is available to all T-Mobile and Sprint customers for free by downloading an app available on Android and iOS. Scam Shield includes Caller ID as well as blocking for suspected scam calls. Scam Shield is one reason why T-Mobile has some of the best cell phone plans you can get.

When Samuel is not writing about networking or 5G at Android Central, he spends most of his time researching computer components and obsessing over what CPU goes into the ultimate Windows 98 computer. It's the Pentium 3.

4 Comments
  • "Calls originated" seems to imply that if a scammer originates their call outside the T-Mobile network, I'm not getting that protection. And I'm feeling pretty confident that most scammers use their own IP telephony...
  • With this information, your caller ID will be able to verify calls from these numbers. If you receive a call that comes from a scammer that isn't signed, for example, it won't be verified and you or your call blocking software will be able to identify it as a potential risk.
  • "a method of verifying that phone calls made over IP are actually coming from the proper origin". I think jsabo is right. Calls originating from POTS aren't going to include the signing, so won't be flagged. I would imagine a lot of SPAM isn't originating via IP telephony. Maybe it is. Spammers and scammers may be on the cutting edge.
  • I miss those "car warranty"spam phone calls. I enjoyed to play with them 😜😜😜