Does US Mobile use CDMA or GSM?

The AT&T network uses GSM (Global System for Mobile Communications) technology, the world’s most popular wireless phone technology.

US Mobile is a GSM carrier . In general, an unlocked GSM phone from AT&T and T-Mobile will work on each other’s networks. If you have a locked device, your carrier can unlock it if you meet their individual criteria. Older phones from Verizon and Sprint, on the CDMA network, don’t operate with a SIM card.

In the About (iOS) or Status (Android) page, scroll down and check for a MEID, ESN, or IMEI number. If your phone has a MEID or ESN number, it uses CDMA, and if it has IMEI, it uses GSM . If you see both, that means your phone supports both GSM and CDMA networks.29 Kas 2021

All Unlocked phones work on GSM networks , while universal unlocked phones work on all major US carriers.