transfer my mobile phone number to my new iPhone?

melid684,

The option is presented during the activation process. However, if you you do not choose to port your number at that point, I would recomend contacting AT&T after the iPhone is activated and ask for the porting department to assist with moving your number over.

Hope this helps,

Nathan C.

I second Nathan's response. The porting department ports numbers all day every day and they did my two Verizon numbers to AT&T after the fact within about 10 minutes.

As mentioned above, you can port your old number but one important warning.
I called Verizon BEFORE I bought my iPhone to make sure that I could port a certain number on my family plan which still had two years left on the contract.
The CSR said yes, they would just give me a new number for that phone.
When I called to get that new number, I was told that by porting the number which still had time left on its contract, I essentially cancelled the account and was on the hook for the $175 early termination fee.
I protested loudly and since there was a call on my bill to CS before I bought my phone, and the rep did log that call, (although w/o details) they finally waived the fee.
So, I would strongly advise you to activate by phone instead of online if you still have a contract with your previous provider.