At&T Prepaid Activation Master Guide: Sim Swaps, Number Transfers, and Plan Setup

Understand the full story behind At&T Prepaid Activation Master Guide: Sim Swaps, Number Transfers, and Plan Setup in our detailed breakdown.

The self-service digital hub handles device registration without requiring an in-store counter visit. Point your desktop or mobile browser to the official AT&T Prepaid activation portal. The system opens with a prompt asking for your primary equipment serials.

If you are setting up a physical card from a retail starter kit, find the 20-digit SIM card ICCID number printed across the plastic punch-out card and the microchip itself (it starts with 8901410). Type this string along with your device IMEI. For eSIM users, the portal requests the 32-digit EID instead, routing the profile straight to the operating system over Wi-Fi.

Next comes the line creation phase. You must enter your five-digit billing ZIP code so the switch can assign a local rate center and exchange code. You will also create a four-digit account security passcode. Choose an unguessable combination. AT&T uses this PIN to verify identity for any future customer care interactions, billing adjustments, and downstream SIM swap requests.