Mobile phone networks have been asked to cut off pimps and prostitutes ahead of the London 2012 Olympic Games.
City Hall chiefs have called on top phone companies to help crack down on prostitution and trafficking in the lead up to the sporting event.
They want help targeting numbers advertised on thousands of sex calling cards that litter phone boxes throughout the capital.
Kit Malthouse, deputy mayor for policing, said the mobile phone numbers are a valuable resource for those behind the sex industry.
He said an agreement must be reached between mobile phone networks and police that sees them taken out of use as soon as they are identified.
Mr Malthouse said: "If you are an American tourist and if you walk into a telephone box you would think it was a sex shop.
"We want a streamlined, agreed process for barring these numbers because they become very valuable for a number of reasons.
The great thing about these sort of plans is that they're always based on the assumption that the people running and using these services are as idiotic as the bureaucrats trying to stop them.
Have City Hall not contemplated that mobile phones are not the only form of communication? And that we might just be living in the information age? Which should make it quite easy for pimps and prostitutes to find a way around this.
The only solution to this problem is to legalise and regulate prostitution. Then at least it might become a little safer for the women and men involved.
Everyone seems to know this apart from the moralising wing of the Conservative Party who currently sit in City Hall.