g1smd - 1:48 pm on Nov 1, 2012 (gmt 0)
Choice of UK phone number will be critical to your success in the UK.
Numbers beginning 084x, 087x, 070 and 09xx are premium rate and cost a lot to call, especially from a mobile. Savvy customers avoid calling these types of numbers. Some of these numbers cannot be called from outside the UK.
Numbers beginning 080x are free to call from a landline, but are expensive to call from a mobile. There are proposals that one day these numbers will also be free to call from all mobiles.
Only numbers beginning 01xx[x][x], 02x and 03xx are inclusive in free minutes from both landlines and mobiles. They are charged at geographic rate when there are no free minutes.