My mom is currently on an iPhone 4 and she's going to deactivate the iPhone 4 sim and reactivate her old phone so I could use the iPhone as an ipod touch (minus the phone features). Few questions. 1. When I try to update to 4.1 or future iOS updates, will it require me to have a sim card (aka ask for activation via each update so I need a working iphone to do this rather than an ipod touch) 2. If I restore the phone to factory setting, will it ask me to activate the phone? 3. If it does ask me to activate the phone and I have a deactivated sim card, will it activate iphone sim card and deactivate the one on my mom's old phone?