If you’re having trouble activating your new AT&T iPhone 4, or if you got an error message when you tried to activate your AT&T iPhone using iTunes or on the AT&T website, don’t worry. Here are some easy instructions to activate it by phone. How to Activate Your AT&T iPhone 4This entry was posted in iPhone Reference Technology and tagged AT&T how to how to activate iPhone 4 iPhone iPhone 4 iPhone 4 activation problems activating iPhone 4 on August 17, 2010 by Steve Jenkins (updated 5096 days ago)