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.

Is Tello a 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).

Who is Tello owned by?

The iPhone 5s is also available for $399. Tello's parent company is KeepCalling, which is headquartered in Romania and has offices in Atlanta and Bolivia. Tello's service is likely to appeal to budget-conscious mobile users who want the flexibility to change their monthly plans on the fly.