My pac code wont be with me from vodafone for another 3 or 4 days. Can I just activate and use the number that comes with the iphone for now, and then port my old number over after? Has anyone done this? it's just sat in it's box at the moment 
Sadly, it is very difficult to get the same answer out of more than one O2 employee, which tends to suggest that most do not have the faintest clue what they're talking about.One of the drones in my local o2 store insisted that you HAD TO supply the PAC code during activation on iTunes and couldn't phone up later to initiate the port.
Not sure what to believe now.
Very useful link, many thanks. Personally, I find that the O2 website is more often than not like looking for a needle in a haystack.You can register (any) 02 phone or sim, and then port your number over later - AFAIK the only time limit is the 30 days that you PAC is valid for.
You can do it on the 02 website here:
02: I want to keep my mobile number
I activated my iPhone on Friday night - but wanted to try it (and 02) for few days before I decide if i'm going to leave Orange for good.
You can register (any) 02 phone or sim, and then port your number over later - AFAIK the only time limit is the 30 days that you PAC is valid for.
You should request your PAC Code to be sent by SMS as well as post, Orange did it for me!![]()