[Skip to content](https://www.t-mobile.com/news/press/tmobile-comcast-inteliqent#maincontent) [Newsroom](https://www.t-mobile.com/news)Toggle secondary navigation - [Network](https://www.t-mobile.com/news/category/network) - [Devices](https://www.t-mobile.com/news/category/devices) - [Un-carrier](https://www.t-mobile.com/news/category/un-carrier) - [Community](https://www.t-mobile.com/news/category/community) - [Offers](https://www.t-mobile.com/news/category/offers) - [Business](https://www.t-mobile.com/news/category/business) English [Press Release](https://www.t-mobile.com/news/press) # T‑Mobile, Comcast and Inteliquent Deliver Industry First in War Against Illegal Call Spoofing November 21, 2019 ![](https://www.t-mobile.com/news/_admin/uploads/2019/11/nr-article-scamblock-11-21-19.desktop-500x325.png) 5 min read - Facebook IconShare on Facebook - Share on Twitter - LinkedIn IconShare on LinkedIn #### What's the news T-Mobile, Comcast, and Inteliquent have delivered the industry’s first end-to-end STIR/SHAKEN call across three networks #### Why it matters Scam calls are not only annoying, they can be dangerous, with individuals losing hundreds and sometimes thousands of dollars to scammers. #### Who it's for Anyone who wants more protection against the growing number of scam/spoofed calls.    Bellevue, Washington and Philadelphia, Pennsylvania — November 21, 2019 — T-Mobile (NASDAQ: TMUS), Comcast (NASDAQ: CMCSA) and Inteliquent, Inc. today announced they’ve achieved an industry first in the war against spoofers and scammers, completing the first end-to-end STIR/SHAKEN call verification across three networks. [T-Mobile and Comcast announced STIR/SHAKEN interoperability](https://www.t-mobile.com/news/press/inter-carrier-stir-shaken-launch) earlier this year, giving consumers with a growing number of capable smartphones peace of mind that calls from Comcast’s Xfinity Voice phones to T-Mobile phones (and vice versa) are not generated by a scammer spoofing a number. Now, calls can be routed through Inteliquent as well as directly between T-Mobile and the Xfinity Voice landline phone service and still ensure that the number displayed has been verified. With this technical first, our companies are expanding what is possible with STIR/SHAKEN, not only enabling peer-to-peer call verification but also connections via tandem networks.     Neighbor spoofing — where scammers hijack a phone number to match the area code and 3-digit prefix of the person they’re targeting — is a common scam. People are more prone to answer calls from numbers that look familiar, putting them at risk of falling victim to fraudsters. Today’s news means consumers are more protected against these types of spoofed calls. “Scammers and spoofers are a scourge on the industry, and at T-Mobile, we’re using every tool available to fight against these bad guys on behalf of consumers,” said John Legere, CEO of T-Mobile. “We were first to announce STIR/SHAKEN readiness, first to implement caller verification, and first to launch cross-network caller verification … we continue to be on the front lines to keep Un-carrier customers protected, and we won’t stop.” “Consumers are tired of getting scammed, and Comcast has developed ways to ensure Xfinity customers know the calls they are answering are legitimate,” said Tony Werner, President of Technology, Product and Xperience for Comcast. “This is another milestone in our efforts to implement STIR/SHAKEN. We were one of the first companies to conduct a non-lab exchange of a verified call and we co-authored many of the core STIR and SHAKEN specifications.” “The communications industry is committed to stopping call spoofing, which seriously harms consumers,” stated Surendra Saboo, Inteliquent’s President. “Inteliquent fully supports the FCC’s recent STIR/SHAKEN initiative, and we’re excited about our new collaboration with T-Mobile and Comcast. Together, we can prevent scammers from connecting with citizens.” STIR (Secure Telephony Identity Revisited) and SHAKEN (Secure Handling of Asserted information using toKENs) standards are recommended by the FCC to identify authentic calls on networks. T-Mobile and Comcast’s Xfinity Voice were the [first to deliver network interoperability](https://www.t-mobile.com/news/press/inter-carrier-stir-shaken-launch) in April 2019. Comcast has implemented STIR/SHAKEN for all Xfinity Voice home phone subscribers, authenticating outgoing residential calls and validating incoming authenticated calls. As part of today’s news, T-Mobile also announced that [Caller Verified](https://www.t-mobile.com/news/press/caller-verified-note9), the Un-carrier’s implementation of STIR/SHAKEN, is now operable across 17 smartphones, with more coming soon. Caller Verified is live today for all T-Mobile and Metro by T-Mobile customers, and customers with these devices and the latest software update will automatically see “Caller Verified” on their screen for authentic calls from the T-Mobile network and Comcast’s Xfinity Voice home phone service.  For more information on all the ways __T-Mobile__ is protecting customers, visit [https://www.t-mobile.com/resources/call-protection](https://www.t-mobile.com/customers/scam-shield). For __Metro__ __by T-Mobile__ customers, more information is available at [https://www.metropcs.com/shop/services/protection.](https://www.metrobyt-mobile.com/shop/services/protection) For additional information about what __Comcast__ is doing to fight robocalls, visit [corporate.comcast.com](https://corporate.comcast.com/press/releases/att-comcast-announce-anti-robocalling-fraud-milestone-believed-to-be-nations-first).    Capable device required.  __About T-Mobile US, Inc.__ As America's Un-carrier, T-Mobile US, Inc. (NASDAQ: TMUS) is redefining the way consumers and businesses buy wireless services through leading product and service innovation. Our advanced nationwide 4G LTE network delivers outstanding wireless experiences to 84.2 million customers who are unwilling to compromise on quality and value. Based in Bellevue, Washington, T-Mobile US provides services through its subsidiaries and operates its flagship brands, T-Mobile and Metro by T-Mobile. For more information, please visit [https://www.t-mobile.com](https://www.t-mobile.com). __About Comcast__ Comcast Corporation (Nasdaq: CMCSA) is a global media and technology company with three primary businesses: Comcast Cable, NBCUniversal, and Sky. Comcast Cable is one of the United States’ largest high-speed internet, video, and phone providers to residential customers under the Xfinity brand, and also provides these services to businesses. It also provides wireless and security and automation services to residential customers under the Xfinity brand. NBCUniversal is global and operates news, entertainment and sports cable networks, the NBC and Telemundo broadcast networks, television production operations, television station groups, Universal Pictures, and Universal Parks and Resorts. Sky is one of Europe's leading media and entertainment companies, connecting customers to a broad range of video content through its pay television services. It also provides communications services, including residential high-speed internet, phone, and wireless services. Sky operates the Sky News broadcast network and sports and entertainment networks, produces original content, and has exclusive content rights. Visit [www.comcastcorporation.com](https://corporate.comcast.com/) for more information. __Comcast Media Contacts__ Joel Shadle, 215-286-2645 [Joel\[email protected]](mailto:[email protected]) __Inteliquent Media Contacts__ Alina Rattanasavanh, 312-380-4562 [[email protected]](mailto:[email protected]) Tags[Cybersecurity](https://www.t-mobile.com/news/archive/cybersecurity)[Government Affairs](https://www.t-mobile.com/news/archive/government-affairs)[Network](https://www.t-mobile.com/news/archive/network) ## Related Stories [More Stories](https://www.t-mobile.com/news/stories) [![T-Mobile and Comcast FIRST to Give Customers New Anti-Robocalling Feature](https://www.t-mobile.com/news/_admin/uploads/2019/04/nr-article-CallerVerified-04-17-19.desktop-500x325.png) \ __T-Mobile and Comcast FIRST to Give Customers New Anti-Robocalling Feature__ \ April 17, 2019|4 min read](https://www.t-mobile.com/news/press/inter-carrier-stir-shaken-launch) [![T-Mobile and AT&T Work Together to Give Customers New Call Authentication Protections](https://www.t-mobile.com/news/_admin/uploads/2019/08/nr-article-Caller-Verified-8-14-19.desktop-500x325.png) \ __T-Mobile and AT&T Work Together to Give Customers New Call Authentication Protections__ \ August 14, 2019|4 min read](https://www.t-mobile.com/news/press/tmobile-att-caller-verified) [![T-Mobile T-Priority](https://www.t-mobile.com/news/_admin/uploads/2026/02/3c2a0e1d-1fd4-42bc-a76b-e644d36bc1cb-e1771625284360-500x250.jpg) \ CommunityStory \ __Built for the Storm: How a Former Fire and Police Chief Helps T-Mobile Support First Responders__  \ February 24, 2026|9 min read](https://www.t-mobile.com/news/community/a-former-fire-and-police-chief-helps-t-mobile-support-first-responders) [![T-Mobile Report: Un-carrier Customers Protected from Over 19 Billion Scam Calls in 2023](https://www.t-mobile.com/news/_admin/uploads/2024/02/120091-004-2023-Scam-Shield-Report_look_and_feel_hero_r3-500x250.png) \ Un-carrierPress Release \ __T-Mobile Report: Un-carrier Customers Protected from Over 19 Billion Scam Calls in 2023__ \ February 28, 2024|8 min read](https://www.t-mobile.com/news/un-carrier/t-mobile-report-customers-protected-from-over-19-billion-scam-calls-in-2023)