(adsbygoogle = window.adsbygoogle || []).push({}); So i just bought a new iphone 4, but used my sisters upgrade. i activated it, but her number is registered into it so basically it is hers. is there anyway to change that? can apple or at&t do it?

the iphone also has the stupid micro sim card..

For what I know you probably can activate it using your own sim-card and she can have her old cell-phone back because Sim-Cards register your Number, Your service like every thing you have like MMS SMS Internet, and contacts... But yeah supposedly it suppose to work with yours... I don't have an iPhone 4, and 1 Question does iPhone 4 only support Micro Sim Cards only because I want one badly am Not sure if mine is compatible.

yes iPhone 4 only supports micro-sims.