SIM cards are so thoroughly integrated into our everyday lives that we don't pay attention to them anymore and do not understand what they are used for. In this article, we dig into the concept of SIM ...

Set up your T-Mobile SIM card. Image source: T-Mobile. To activate your new T-Mobile SIM cards. As a Sprint customer, your new T-Mobile SIM card either comes with a Magenta sleeve or not.

Refill T-Mobile online. Filling up online from your My T-Mobile account is easy and allows you to enroll in AutoPay, if desired. To refill your account online, go to the My T-Mobile website and enter ...