Activate a SIM card Insert your SIM card into the device and turn on the device. Follow these prompts if you choose to complete the process online. If you opt to do it over the phone, call 866-893 ...

How to activate a T-Mobile SIM card on your phone Activating a T-Mobile SIM card with your phone is the most common method. These steps show you how to do it: Power down your phone and then insert ...

These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another.

If you're used to slapping a physical SIM card into a phone, here's how to activate a Cricket eSIM.