Is AT&T GSM

All unlocked phones work on carriers that use GSM networks . Popular U.S. carriers that use GSM networks include AT&T, T-Mobile, Cricket, MetroPCS, Simple Mobile and Tracfone. Most foreign carriers also use GSM networks. You will need to use a SIM card from a GSM provider to get service for your unlocked phone.

Carriers operate under one of two types of networks: CDMA or GSM. Out of the four biggest carriers with their own network, AT&T and T-Mobile run on GSM , while Sprint and Verizon Wireless use CDMA.

Great questions! We use CDMA . The network is America’s largest, most reliable 4G LTE, with the most reliable hotspots.