Activate your iPhone back to AT&T if the SIM card you insert after you install blackra1n onto the device doesn't work properly. Blackra1n is a third-party program that "jailbreaks" SIM-bearing iPhones ...

You may have had AT&T SIM (Subscriber Identity Module) card problems on your iPhone before or received the notification "Airtel SIM not provisioned." This happens sometimes, and the reason is fairly ...

Apparently numerous people are facing difficulty activating their new iPhone X, so if you are experiencing that you aren’t alone. But, activation issues aren’t limited to the iPhone X. There have been ...

Sareena was a senior editor for CNET covering the mobile beat, including device reviews. She is a seasoned multimedia journalist with more than a decade's worth of experience producing stories for ...