You can activate your AT&T SIM in-store, online, or by contacting customer service. The process is similar for postpaid and AT&T prepaid customers.

[Jason Gin] wanted to reuse the SIM card that came with a ZTE WF721 wireless terminal he got from AT&T, but as he expected, it was locked to the device. Unfortunately, the terminal has no function ...

Verizon, T-Mobile, AT&T, all guilty,” she declares. She adds, “Workers are able to bypass these security prompts and give these people the SIM cards. My neighbor is out $4,000. That might not ...