Hey Gary,
The company that cold called you seems to be dodgy. Lots of people saying they are skanks.
http://www.google.co.uk/search?clien...KsjKjAe-o8GmDg
http://www.google.co.uk/search?clien...Gdi4jAfoy9zIDg
Oh, and with the SIMplicity thing I recommended, you obviously also keep your existing number. You just stop paying so much. And only have a monthly commitment.