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.

Activate a new SIM card with Cricket According to Cricket's website, if you order your service online, you'll use the same avenue to activate your new SIM.

If you're a new Metro by T-Mobile customer who bought a SIM card online or in a retail store, you'll need to activate it, and we're here to help.

Before you can activate your SIM, you need to know which type of SIM your device supports, allowing you to choose between an eSIM or a physical SIM card.

To use Tello's service, you will need to activate your Tello SIM card. Activating your Tello SIM card is a simple and this guide will show you exactly how to do it ...

He writes: "My iPhone came complete with SIM installed, and once I had downloaded and installed the latest version of iTunes, it took less than 20 minutes to activate the phone and it worked ...