Switching to the Un-Carrier can be exciting, but you have to know how to get set up. Here's how to activate a T-Mobile SIM card.

Need to access your Android device's SIM tray but can't find the ejector tool that came in the box? All hope is not lost. There are a few things you can try.

10. Test the SIM Card in Another Phone Verify if the SIM card is functional by inserting it into another phone: Use a spare phone to check if the SIM card can connect to the network.