Changing contracts

[Amp34]

Ok i've reached the end of my contract with O2 and want to get a new phone. As Im a very low user I wont be able to get the phone I want on O2 (k800i) so am going to get a new contract. I just want to know how i go about getting one. How much notice do i need to give O2 to cancel my original contract and is there any way i can keep my number? I assume I will have to give about 1 months notice and then order the new contract say the day before the end of the ending one?

Any help would be appreciated

Thanks

 

[Amp34]

Hmm ok thanks guys. I'm on my 13th month at the moment so i can liteally ring up and cancel for the next day then? (or similar) I got my contract through buymobilephones.net, i assume that the same as a highstreet shop in terms of keeping the number as i will be going through someone similar depending on who has the best deal at the time?