By Marcus Leach

Transport for London (TfL) have announced plans to upgrade more than 120 underground stations implementing Wi-Fi technology in them before the 2012 Olympics.

The transport authority have invited tenders for the wireless connections, and a contract to the chosen bidder will be awarded before the end of 2011.

With the new technology those using the underground will be able to use smartphones, tablet computers and laptops on London underground stations by June 2012, although the service will not extend to the trains themselves.

The service is planned to first start with London Underground opening the existing wi-fi for staff at 16 stations to the public.

Once the contract has been awarded the successful company will have around six months to get the network in place.

"The roll out of wi-fi technology across the platforms and public areas of our tube stations will finally allow Londoners to use mobile devices to pick up their emails, access social media sites and stay in touch with the world above while they traverse our subterranean transport network," London Mayor Boris Johnson said.