Cheers siban.

Certainly leading more towards Tesco's offer now, although I have heard many iPhone users on various network with BT Openzone packages having trouble accessing it, like an orange user I knew. I am with 3 network at the moment no problem with 3g if a little tad slow, before I opt for a bigger package but don't want to find myself disappointed with the new service.

BT openzone looks widespread enough. you can check on their website to see if your particular work areas are covered. 3 is not so good out of London or big town centres in my opinion. If you are using open zone remember you are still covered with 3g access. you may want to know which network i being used by tesco because they piggy back on one of the major networks so that you can check the coverage.

Got an iPhone and I'm a heavy user on the internet - bordering 1GB allowance every month due to my work requires me to do alot of public transport travelling.
So thinking of upgrading my contract with 3 - they offer a good value £15 per month, no long term contract allowing truly unlimited data access on their 3G network. But now Tesco offering slightly similar £12.50 per month (short-term 3 months contract) includes 1GB data access BUT with unlimited BT Openzone Wi-Fi access.

Tesco offer sounds great as I know Wi-Fi access is faster than 3G access and less battery draining, but my main concern is reliability as I am questioning the BT Openzone accessibility. I want to use internet wherever and whenever - especially on trains in and out of London.

Can anyone advise?? Cheers