Just posting this if it helps anyone. I was in London this past week for 5 days. I have an unlocked iPhone 3G (factory unlocked).
T-mobile gives you a free pay as you go (prepaid) SIM card. They have a web bolt on that costs 2.50 pounds for 5 days of unlimited 3G internet. I just topped up 5 pounds and got that bolt on and it worked great!
T-mobile gives you a free pay as you go (prepaid) SIM card. They have a web bolt on that costs 2.50 pounds for 5 days of unlimited 3G internet. I just topped up 5 pounds and got that bolt on and it worked great!