I am going on holiday to the Washington DC area for 3 weeks this summer, and I would like to take my iPhone with me. I realise that this means that I would have to look at a) paying out of the nose for O2's roaming fees b) switching the roaming and data off and having a too fat iPod touch or c) getting a US sim and using that for data. What is my best chance at a USA deal? I know over here in the UK I can go into literally a corner shop and pick up a PAYG sim, but I understand its a little less free in the USA. I don't really care about calls, I literally just want to be able to keep up my normal speed of twitter feed, facebooking and google searches. Thanks for your advice.