Activating a new SIM card on your iPhone is a simple process that just takes a few easy steps. Read more: Best iPhone of 2024 Follow our step-by-step guide to help get your new iPhone up and running.

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.

A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text messages, and more.