The answer for current O2 customers wanting to upgrade to the iphone...

[sowlerrmgh]

As we all know stock is very low at CPW and O2 stores however Apple stores have lots of stock.

It is possible to tell O2 you want to leave and get a PAC code (takes under 2 days to get the code) then go to the Apple Store and sign up as a new customer and use the PAC number O2 gave to port your old number.

 

[majorp]

This depends whether you are still locked into a contract though.

 

[byron_hinson]

This depends whether you are still locked into a contract though.

Yeah you'd either have to pay off your contract with O2 before you get the PAC code or pay a large fee before they just let you leave seeing you entered a contract with them.