T-Mobile today announced that it has completed implementing the STIR/SHAKEN phone number verification technology with all major US network providers. This allows T-Mobile to authenticate that an incoming call is coming from the actual phone number displayed in Caller ID. This helps fight phone number spoofing, a common tactic used by scammers and illicit robocalls to evade identification and enforcement. The FCC has mandated that all network providers in the US implement STIR/SHAKEN on their modern (IP-based) voice networks by June 2021.


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