It’s super easy to jump from one to another when you own an unlocked phone, especially if you ... certainly support GSM carriers like AT&T and T-Mobile, it’s best to look for devices that ...

Quick tip: If the phone is already unlocked, T-Mobile's site offers a guide for using the phone with other carriers. How to unlock an Android phone on T-Mobile The process will vary slightly ...

An "unlocked" phone gives you complete freedom from carrier restrictions. You can insert a SIM card from AT&T, T-Mobile, Verizon, or any other compatible carrier and start using their service ...