T-Mobile charge £7.50 per megabyte transmitted via GPRS, the same for international. After testing with a Laptop in the UK I visited the EU for a week. I received a bill for over £200, and the charges keep coming in. Only retrospectively was I told that the online billing system can take 3 months to update, I have no idea what the final cost will be. Even though costs are supposed to be the same, charges overseas seem to me much more for similar usage in UK. I read somewhere that this is due to the foreign telecom companies re-transmitting data packages when a timely reply is not received. Does anyone have any information on this? If true, it means that the information given to me by T-mobile may have been misleading, and I may have some means of redress. Overall, the cost of the data usage was more than double the cost of the holiday - heartbreaking. Had I known these astronomical costs in advance, I would have used an Internet Cafe for €1.20 an hour. I have now disconnected the GPRS service.