T-Mobile has officially shut down its 2G GSM network—the last major US 2G holdout—meaning the original 2007 iPhone can no longer connect for voice service in the US. T-Mobile says it kept 2G running longer than AT&T (2G off in 2017) and Verizon (2G off in 2020) to avoid stranding remaining customers, including international travelers and legacy IoT devices. Dealers should treat this as a practical upgrade moment: identify any 2G-dependent phones, alarms, meters.

T-Mobile is officially retiring its 2G GSM network on August 3, 2026. Most customers won’t notice—but anyone using very old phones, certain legacy IoT devices, or older international devices without VoLTE could lose service. Dealers should run a quick “network readiness” check, offer low-cost upgrade paths, and position paid setup/data transfer as a simple, same-day fix.