I am ready to purchase an iPhone 4 since my iPhone 3g contract is running out and I am ready to rid of my slow iPhone, but I had a quick question. When I get the iPhone 4, can I let my wife use my iPhone 3g. For a little background to this situation, my wife got a new phone (Samsung Solstice) and 2 year contract with ATT last October. Is it as easy as just purchasing the iPhone data (200mb or 2gb) plan and dropping her SIM card from the Solstice into the iPhone. I'd also assume she'd remain on her current 2 year contract since she isn't purchasing another phone. If this question has been answered somewhere, please point me in the right direction. I searched the forums and couldn't find an answer to this particular question. Thanks!