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  2. 877-426-0525
    • According to 2 sources
    You can activate your AT&T SIM from the phone you're installing it on. Call 877-426-0525 for automated instructions. Have your ICCID and IMEI numbers ready. You cannot activate your AT&T SIM with an EID number over the phone.

    How to activate an AT&T SI…

    androidpolice.com
    To activate your new SIM card with AT&T, you can follow these steps: 1. Gather your SIM card and IMEI number. You will need these for the activation process. 2. Call AT&T customer service at 877.426.0525. This is an automated activation line, and you will be prompted to enter your SIM card and IMEI numbers.

    A Guide to AT&T SIM Activat…

    devicemag.com
     
  3. AT&T
    https://www.att.com/support/article/wireless/KM1008711

    Activate and Use Your Device - AT&T Wireless Customer Support

     
  4. AT&T
    https://www.att.com/activation

    Activate your AT&T Wireless & Prepaid Device | AT&T