Ok guys i live in the UK and looking to do my support on the go!
Should i use skype as my VOIP and buy a number off them or should i search for a alternative?

Most of the time im out in seeing clients and diverting the BT phone to my mobile which cost 2much!!!

Any advice from the experts?

I'd definitely recommend using a voip provider/combination of such.

Currently I use an in-house hosted PBX (asterisk), with a few trunks - voipcheap for outbound and for DID's callwithus.com. This solution has been working quite well for the most part. You'd probably want to use the voipcheap.co.uk counterpart of course.

Thanks so can i use via mobile or by using the one voip to the other to benefit from the calls?
Would they give me a number which i would be able to use to be contacted on?