I may have misunderstood a feature of the new iPhone. If I buy a an iPhone 4S... can I get it activated on either Verizon or AT&T? Reason I am asking: I have a family member who is not interested in upgrading their phone on AT&T. My father on Verizon is not eligible for the upgrade price until March. Can I buy a phone though AT&T on a line thats eligible and send it to my dad who will need to activate it on Verizon?