Available Now: Buy the new iPhone 14, iPhone 14 Pro and iPhone 14 Pro Max from AT&T!
Enjoy 16GB of high-speed data for $25/mo.
S1bone3S's profile

New Member


1 Message

Mon, Aug 15, 2022 8:53 AM

*#*# USSD activate SIM CARD CODES

I would like to activate SIM CARD by star one two three method

Accepted Solution

Official Solution


Community Support


200.1K Messages


Let's look into those SIM card short codes together, @S1bone3S.


Please share the type of device that you have and if you have PREPAID or Postpaid services.This will help us determine which steps we will use for that specific device or service. *123# is a new and unified USSD code for Smart, TNT, and Sun Cellular, with whom we are not affiliated with. In the meantime, you can access our activation portal to get started. Just click the blue box on the left and enter your phone number.


Next, you can activate your SIM and eSIM card with this resource. Many devices use a physical SIM card that comes with your new device. It often has the SIM card inserted. If you use a different SIM, you might not be able to access our wireless network or take advantage of all network features.If your SIM isn’t already inserted, learn how to put it in. Go to Device Support.


1. Choose your device.
2. Scroll to Getting started and select Hardware & phone details.
3. Choose Insert or remove SIM card and follow the steps.


Please share the result with us. Thanks for reaching out to  AT&T Community Forums!


Nelson, AT&T Community Specialist





Need help?
Fix, replace or check device delivery
New to AT&T Community?
New to the AT&T Community? Start by visiting the Community How-To.
New to the AT&T Community?
Visit the Community How-To.