An email warning people to beware of a phone scam that could cost them £20 a minute is a hoax.

The email warns people about receiving a recorded message which tells them they've won a prize, and then asks them to press '9' to hear further details.

"If you stay connected, after 11 minutes a recorded message asks you to key in your postcode and house number. After a further 2 minutes callers receive the following message:

"'Sorry, you are not one of the lucky winners.'

"After this the line disconnects," the email says.

Not only are phone owners tricked into running up bills of up to £260, the email adds that BT is "relatively powerless to stop the calls".

A spokesman for the UK's dominant fixed line telco said he'd received a number of calls on the subject.

"It's a hoax, technically impossible, an urban myth," he said. ®