T-Mobile says it’s winning the fight against SIM swap attacks after years of trouble

TL;DR T-Mobile says successful SIM swap attacks have dropped by more than 99% since 2022, following stronger account security measures. The carrier also reports a 99% reduction in phishing-related employee credential compromises and billions of blocked scam calls and texts. Despite these improvements, attempted intrusions increased 37% over a recent 12-month period, showing that security threats remain a serious challenge. T-Mobile knows better than most carriers how expensive a stolen phone number can become. Earlier this year, the Un-carrier paid out $33 million after a SIM swap attack cost a customer $38 million in cryptocurrency. Add the carrier’s troubled history with data breaches , and it’s easy to see why security promises alone might not inspire much confidence. But T-Mobile now has some striking numbers to back up its latest claims. In a new cybersecurity report published today, the carrier says successful SIM swap attacks against its customers have fallen by more than 99% since 2022. That’s a remarkable turnaround for a company whose security record has repeatedly made headlines for the wrong reasons.