Thus spaketh Louis:
> There used to be some sort of lookup table which told you which
> networl a UK mobile number was on. Can't find it any more.
>
> How can I find out which network (or more importantly, how much it
> costs from a lanline or calling card) to call this number:
>
> 07096 805 XXX

070 numbers are personal numbers / find me anywhere numbers, and not
mobiles, so can and often do cost a lot more than calling a mobile.

http://www.magsys.co.uk/telecom/codelook.asp