Hi. My AT&T contract is till September 2013, but I was thinking of getting an iPhone 5 with Verizon and paying an early termination fee to AT&T. I would like to keep my current phone number on AT&T. When I open a phone plan with Verizon, can I just get a number from them for now... and then port my number from AT&T to Verizon like a week later (since I won't terminate the ATT contract till a week later) and replace the initial number Verizon gives me tomorrow...? Or do I have to port the number from AT&T to Verizon immediately when purchasing the iPhone 5 on Verizon's plan? Thank you for your help.