My situation is a little confusing and I would greatly appreciate some feedback from others who have more knowledge regarding the situation. My iPhone 3GS was water bricked For 29 days I used an unlocked iPhone 4. I went to an AT&T store and got a micro sim for it; once I had had it for 29 days I returned it to the Apple store but kept the micro sim Since then I've been using a family member's old flip phone. I went to an AT&T store and got a regular-sized sim card to use with it My cell phone number is not eligible for an iPhone 4S upgrade On the day of the announcement I used my mother's phone number for the iPhone 4S upgrade (she was eligible) through Apple's site. When purchasing the 4S I had to sign up for a new 2-year contract on her number I am on the same family plan as my mother Once I receive my iPhone 4S what should I do? The current plan for my phone number has unlimited data so I desperately don't want to lose that. Is the micro sim I used for the interim iPhone 4 still activated? Or did switching back to a regular sized sim card to use with this POS flip phone deactivate it? I apologize if this is needlessly confusing and I thank you in advance for help!