i have a 2g iphone that i bought from ebay. been using it for about 2 months now, and it started to act up on me. one of the issue that i have is at random, when i pick up a call i would not be able to hear the other side, and i have to restart to get it working. the phone is still covered by AppleCare Protection Plan, i want to bring it in to the store and have them fix this or replace it if it can't be fixed. but the thing is that i have Tmobile, i dont have a ATT sim. Has anyone tried bringing there phone in for warranty without a ATT sim card? did they give you problem(s)? how did you get them to repair/replace the phone? TIA for helping *btw the phone has been dropped before, there is a dent on the top left on the phone, will this void the warranty?