New iPhone user question

Hey guys,
I am currently a Verizon customer and looking to switch to AT&T to get the new iPhone 4G. I don't want to port my number from Verizon to AT&T right away until I try the phone out for a couple days to make sure reception is ok. My questions is that if I pre-order the iPhone on the 15th and get a new number, can I take the phone to AT&T and port my Verizon number over after a couple of days once I know reception and everything works ok or am I stuck with the new number when I pre-ordered?

 

Not sure if AT&T does this but here in Canada you can post date your port in number to whatever date you want. So what I would do is just ask AT&T and see if you can do the same.

 

Yes, you can port your number in later. No prob.