Unable to Port Number from T Mobile to AT&T with iPhone 5

Hi,

I am trying to pre-order the iPhone 5 online and I am getting the error message below - "The number you'd like to port cannot be ported to this service area. Please verify the number and address or click Go back and select "No" to the "Transfer your number" question to skip this step."

"The service area of the physical address entered does not match the phone number that you’ve asked to transfer. Please verify your phone number or enter the address where you plan to use your iPhone most often."

I am porting my number from TMOBILE to AT&T.

If I request for a new number online (so that I can place the order for iPhone 5), can I still port my iPhone to my existing TMOBILE number afterwards or will I have to get a new number?

Thanks,
Varun

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