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MINISTERS want to block the phone numbers of prostitutes who advertise their services in newspapers and telephone booths in an attempt to stifle the illegal sex trade.

Police forces would identify suspected prostitutes to the telephone companies, which would be required to cut off their numbers.

The proposal has emerged in a six-month review of prostitution laws by ministers from three government departments. They are also considering making it illegal to pay for sex.

Vera Baird, the solicitor-general, said it was important to curb “the industry of prostitution” and the demand for call girls if the stream of trafficked women into Britain was to be stemmed.

Critics warned that blocking telephones could drive the trade underground, making it harder to police, and would force more women to walk the streets in the search for business. They also warned that it could criminalise legitimate escorts.

“It is 10 times more dangerous to work on the streets than in a flat. It will drive it underground,” said Cari Mitchell of the English Collective of Prostitutes.

Last month Baird, Vernon Coaker, a Home Office minister, and Barbara Follett, the women’s minister, visited Sweden where it is a criminal offence to pay for sex. All the main Swedish telephone companies have a voluntary agreement with the phone regulator to cut off the lines of brothels and prostitutes.

Prostitution visibly decreased in Sweden after the initial crack-down in 1999; but it has now moved from the streets to hotel rooms, organised through the internet, and to neighbouring countries.

The ministers have already spoken to local and regional newspaper representatives about withdrawing advertisements for prostitutes — often promoted under the guise of massage services.

Baird also wants more local newspapers to publicly name and shame men convicted of kerb-crawling as a deterrent to others. She praised local papers in Middlesbrough for identifying men who have been convicted of using prostitutes.

Other MPs fear that the measures could backfire.

Lynne Featherstone, the Liberal Democrat equalities spokeswoman, said: “It is a very good thing that the government is looking at this, but there is a danger that it could drive prostitution underground. Any moves to try to eradicate the client side would have to be incredibly carefully handled. In an ideal world prostitution shouldn’t exist, but we don’t live in an ideal world.”

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