Im happy with O2 UK. I know others have had a real pain. I was frustrated with not being able to get a 16 Gig after the upgrade-online fiasco and really did not want to do massive queueing at an O2 store. After a call to O2 I was told that I could pop into Apple, pick up a new phone + contract, come back home and call them. They cancelled and transferred my SIM to the new phone. All done and I have my black 16 Gig. Wonderful. O2 were really helpful and polite.