People in the UK who are planning to mostly use the N900 for data, and who only make occasional use of voice or SMS, may wish to consider the Virgin PAYG SIM. Data is 30 pence for each day that you use it, unlimited. Virgin's definition of "unlimited" means up to 25 megabytes (after which there's a steep per-megabyte charge). Or, for £5 from your PAYE balance, you can buy their Mobile Internet Bundle. This runs for a month, and is unlimited. Virgin's definition of "unlimited" means 1 GB, but if you exceed that it seems that you go back on to the 30p per day charge for any days that you use internet over the rest of the month.