Hi We are caravanners from UK and use mobile broadband in our van. This is quite cost effective but becomes prohibitively expensive whe we travel abroad. We will be travelling to Las Vegas early September to begin a 2 month RV tour of Western USA. We would like to buy a SIM that can be used in our Huawei E220 HSDPA USB dongle plus a couple of months PAYG top ups. Someone recommended T-Mobile but their on-line chat operator didn't seem to understand what I needed. We will only be staying in Las Vegas for one day before collecting our RV and don't want to spend all the time trying to sourt this out. Please can anyone help?