Tello, a prepaid cell phone carrier, now runs on T-Mobile's nationwide network and offers prepaid plans featuring talk time, texting, and data at an affordable monthly cost.

Does Tello use ATT network?

Tello works with CDMA devices, meaning phones from Sprint and Verizon will work with Tello. Phones from AT&T and T-Mobile run on GSM networks, though, so you will need to get them unlocked to use with Tello.

Does Tello use GSM or CDMA?

2. Your device is a CDMA network only device. Tello only accepts unlocked GSM devices or unlocked multi-network phones that incorporate both CDMA & GSM (Examples are Apple iPhones, Samsung Galaxy, and Motorola X).