T-Mobile officially retired its 2G GSM network on August 3, 2026, marking the end of 2G service from all three major U.S. carriers. Juli Clover for MacRumors:‎T-Mobile kept its 2G network active because it still had some legacy customers who were using it. Customers who were still on T-Mobile’s 2G network were warned well ahead of time about the shutdown and given time to transition. AT&T ended support for 2G almost a decade ago in 2017, and Verizon stopped supporting 2G in 2020. Now that no carriers in the U.S. support 2G, legacy devices like the original iPhone will not be able to connect to any cellular network.