I've got the opportunity of buying an unlocked iPhone tomorrow, and given that it's unlocked and open to all networks, I'd prefer to make use of a PAYG sim card. I also travel quite frequently, so would really benefit from being able to use other sim cards - another reason for considering this option now, rather than waiting. I'm not fussed about visual voicemail, but the web & email functionality is very important (that being the main reason for wanting an iPhone). I've been trying to determine which network would be best for my needs, specifically unlimited browsing. Orange I know has Edge, but I haven't been able to find any details of costs or whether they have an unlimited option on PAYG. o2 have an unlimited option for £7.50 per month, however it's restricted to their 'approved' sites, so I'm not sure it will work properly. T-Mobile seem to be the best option, £7.50 per month for unlimited data. I've seen conflicting reports about whether their network is Edge enabled or not though. Does anyone have an iPhone running in the UK on any of these networks? If so, any problems with browsing/email? Any other recommendations?