I have pre-ordered the 4S from Apple, and am currently considering my network options come friday. GiffGaff goodybags, a The One Plan on Three look particularly good (although open to all suggestions). I like the potential for unlimited data, especially the tethering permitted on Three. However, if reception is as bad as some people suggest, unlimited is essentially pointless. I was hoping I could get the opinion from people who have used Three and/or GiffGaff, and other UK networks and how their experiences have been. I have searched google without much luck as lots of network reviews seem to be old or irrelevant. I'll start..... I've been with o2 for as long as I've had a mobile. I have never had a good reason to change. I have never had any problems with the network itself, with regards to coverage, speed etc. I have had fixed term contracts, and simplicity contracts, and changing has always been easy with the help of customer services. Recently there was a bit go a c*ck up when swapping from BB data to iPhone data, so I was charged daily data rates. Very frustrating at the time, but upon speaking to CS, they realised the mistake, refunded the data charge and I am currently receiving a £5 off loyalty bonus each month from my simplicity contract as a result. On the downside, I feel o2 are pretty stingy on the number of minutes for the cost of the contracts they offer, and a 500mb data bolt-on for £6 each month, does not seem as competitive as other networks. Hence my reason for looking elsewhere. I am fully aware some forum users are purely here plug the services of some networks (I won't name any names), so I will choose to take these opinions with a pinch of salt. But would appreciate any other views, good or bad to help me make an informed decision. This might help a number of people, and should be more accessible than searching through the UK iPhone 4S thread (all 59 pages currently). Cheers.