Hi there. I'm in the UK and have iPad with Wi-Fi and 3G (mobile data). For 3G I use a micro-Sim, Pay As You Go, from the 3 network. I want to know how to use the 3G facility outside the UK. I am travelling to the US on vacation in a couple of weeks. I asked customer service at 3 and they were little help, just sending me a data sheet on using a mobile phone outside the UK! Do I need to buy a PAYG micro-SIM from a store whilst I'm the US? Or do I just turn on roaming on my iPad and it'll use my 3 micro-SIM?. Hope someone can help me. Cheers. Dave.