your eSIM or SIM card is set up and activated. However, when you switch to AT&T and bring your existing phone, you must activate your new SIM card before using your plan. This guide walks you ...

It's important to know that the size of a SIM card doesn't influence its characteristics, such as its memory or data included. To activate an AT&T SIM card, insert it into your device, switch it on ...

Before diving into the activation process, take a moment to check your Sim card packaging. Ensure you have all the necessary information at hand, such as your Sim card number (ICCID) and any ...