When you buy a new phone from AT&T Wireless, your eSIM or SIM card is set up and activated. However, when you switch to AT&T and bring your existing phone, you must activate your new SIM card before ...

Make sure you're eligible to change your number First, make sure your account and cell phone are eligible for a new number. If you're still within 30 days of your initial activation with AT&T ...

The FCC wants to require all mobile carriers to unlock mobile phones within 60 days of activation. But neither AT&T nor T-Mobile are on board with that idea. In June, FCC Chairwoman Jessica ...