Happy New Year! I'm sorry if this is off-topic for an Android forum, but I'm in a time crunch since I'm leaving in London in 2 days. I'd appreciate your indulgence. I am going to London for 6 months. A friend who is going with me went to Best Buy and bought this set up: A $20 AT&T GoPhone (U2800A) An H20 SIM Starter Kit with free international calling. A $50 H20 calling card with free International calling. He activated the phone by following the instructions at the H20 Website and placed a call to London from the US. My bottom line question is this: Will this setup work once we get to London? Will we be able to call within the UK and also back to the states? Some more details: When I went to Best Buy and asked about the set up, I was told that not only won't it work in London, the phone will not even activate once the H2O SIM card is put in. They said the phone is locked to AT&T and will display "Inoperable" if any other SIM card is installed. OK, we know that Best Buy is wrong because my friend has used the phone to call London and he did not go through any unlocking process. He simply followed the instructions at the H2O website. I decided to go to an AT&T store, explain the situation and ask for their honest opinion. In fact, I went to 2 different AT&T stores and basically got the same answer: While neither of the people I talked to were familiar with the H20 SIM card, this is what they said: Best Buy probably gave me the "corporate answer" that they are all trained to give. "It won't work." However, since we know that it does work, because your friend got it to work, then it's very possible that it works for calling from the US since the phone will connect with the AT&T GSM network in the states. Once you go overseas, the phone itself - regardless of what SIM card is in it - won't connect to the network and therefore will not work outside of the US. They both said that they can't say for sure that it won't work because they are unfamiliar with the H2O SIM card, but they suspect that it will not. Can anyone tell me definitively whether or not it will work in London? Thanks!