Been getting a lot of cold calls on your mobile recently?
From 02920368701 by any chance?
It’s all crappy spam.
Long list of numbers here, along with some commentry.
The company have been doing it since early Oct. 2006.
Of course, my preferred method of dealing with them is to pick up the phone and say any of the following:
“Sussex Police Serious Crime Office, Detective Smith speaking . . . .”
“Yeah Hi can I speak to Dave please”
(Beauty of that is that you confuse them no end)
“YOU AGAIN – I WARNED YOU TO STAY AWAY FROM MY WIFE! I’M GOING TO F**KING KILL YOU!”
Again, this one is good, because you are shouting, swearing and being abusive, and you’ll be struck off their list . . . Hopefully.
Got any more suggestions?

Answer the phone as if you were someone else, i.e “MrCrip’s Phone, can I have your password?” That really pisses them off.
Or (this one is more extreme)
In a choked voice, answer and again pretend you are answering on the behalf of the phone owner and the explain the person they want to talk to died in a freak car accident.
The c*nt on the other end of the phone will be off quicker than my whores pants!
More of this at http://www.mrcrip.com/