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.

Virgin uses T-Mobile's 3G network, so basically you're paying 30p per day instead of £1 per day by using Virgin PAYG instead of T-Mobile PAYG, in return for one big downside: the need to watch your usage to make sure you don't go above 25MB per day.

http://www.virginmobile.com/vm/gener...les.shop.sm034
http://www.virginmobile.com/vm/gener...iff.shop.sm285

Regards,
Roger