I was planning on trading in an iPhone 4 16gb Verizon for a verizon iPhone 5 16gb for another family member on my plan at best buy . My wife currently has the white iPhone 4 8gb and is out of space. Can I give them her white iPhone 4 8gb(after putting the 16gb on her line) and still get the $150(it's in perfect condition). I just wanted to make sure I would receive the full $150 even though it's a smaller capacity. Also, has anyone found any hidden catches in the trade-in program?