Indeed but I was talking about PAYG and you were talking about a contract
£7.50/month and £1.50/MB data
while roaming is a pretty good deal. There are other similar deals around I think - a fairly recent development.
But I don't think many pilots will want to be paying £7.50/month for a SIM card which is stuck inside a laptop or inside some GPRS/3G adapter. This is what I was getting at when I mentioned using one's main mobile phone as a GPRS/3G modem - then it can make sense because most people use their mobile phone sufficiently (for voice) to make this a reasonable deal.