A: Hi! I’m with AT&T. It depends on what type of iPhone you now have. iPhone 4’s, for example, use a micro SIM card, so they are not compatible with phones that do not use Micro SIM cards. Either way, you’ll want to let us know when you swap your SIM card so we can update our systems and make sure you have an appropriate data plan http://bit.ly/cfnAor. If you need help with your SIM card or changing your data plan, please let me know. I can be reached at
[email protected] Mon-Fri 9am-6pm CST. Please be sure to include your account number, contact number, and username from this site. Thanks! –Jenn S., AT&T Social Media Manager