Advice
Well first off all:

DONT PRESS RANDOM NUMBERS!

This can be dangerous, especially if they have their system set up to forward to another line, especially a premium rate line.
TPS is shite, with them for years, foreign companies couldn't give a toss about it and they're bound by no laws. Also they found a loophole in the TPS system. Basically they use a system called random digit dialling. They pick an area code, and randomly generate the numbers, and get away with it.
I've rang BT myself, they will offer you one months free trial of one of their privacy packages, can't remember which one though i'm afraid, was more than a fiver per month though, so i declined.
Otherwise the best suggestion i can give you, is when they ring, pick up the phone and don't stop saying yes.
"Do you want to consolidate your loans?"
"YES!"
"Are you the home owner?"
"YES!"
"How much are you in debt?"
"YES!"
It's hilarious listening to them getting frustrated.
( Laice , was Rogitating on, Tue 8 Sep 2009, 2:54, 1 reply)

If a company forwards your call to another number...
They pay for that leg of the call, be it premium rate or whatever (unless you've dialled the operator or a 118 number). There are lots of chain emails warning people that they'll have to sell their children into slavery and sell a kidney if they press the wrong button on the phone, but there's no truth to them whatsoever.
(Vice Admiral Sir Charles Cockbrush KCB MBE DSO, who is finding it increasingly difficult to log into b3ta.com wants to duck your aunt and kick your puppy, Tue 8 Sep 2009, 9:15, closed)