If you’re bringing your own phone (BYOD), use our AT&T Prepaid Online Activation page to get started. For AT&T Prepaid phones purchased from att.com and have a physical SIM, it’s as easy as turning on your new phone. The SIM is already installed and ready to go. Phones with an eSIM can be activated by following the device specific instructions on our eSIM Get Started guide. More @Wikipedia
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