"I'm on the train" is something you don't have to worry about that much on the Tube, however all that could come crashing to an end if Mayor of London Boris Johnson gets his way.

According to London Business free-sheet City AM, Johnson is nearing an agreement with all the major operators to have a "network signal on the entire Tube network by the time the Olympics come to London in 2012."

It is hoped that Vodafone, Orange, O2, T-Mobile and 3 would bare the cost of installing the network rather than the London Underground or taxpayers.

City AM is citing the Greater London Authority as saying that "finding a solution remains dependent on the market providing a credible proposal that satisfies both technical and commercial considerations."

The idea of having network coverage underground is nothing new. Mayor Livingstone held talks during his reign and even as far back as 1992, Rabbit telecommunications attempted to put a phone system in the London Underground.

It didn't succeed.