T-Mobile Closes 2G Network on Aug. 3, 2026, Ending 2G Service for All Major US Carriers

On August 3, 2026, US mobile carrier T-Mobile formally switched off its 2G GSM network. With this step, the three major US mobile carriers have all fully discontinued 2G service. The move means early smartphones such as the original iPhone, alarm panels, payment terminals, and various IoT devices will no longer be able to connect to any mobile communications network.

T-Mobile had previously kept its 2G network running to serve domestic customers still using older equipment and to provide voice calling for foreign visitors entering the United States with international roaming agreements. Before closing the network, T-Mobile coordinated with relevant operators worldwide and notified affected domestic customers in advance, giving them time to upgrade equipment and make the transition.

In the network phase-out process, AT&T was the first to close its 2G network in 2017, and Verizon ended its 2G support in 2020. Because the original iPhone supported only 2G, it had already largely lost mainstream network support after AT&T's shutdown; the final route to connectivity through T-Mobile's network has now also definitively ended. In addition, the three major US carriers had retired all 3G networks as early as 2022, and no longer support early LTE handsets that do not support VoLTE technology.