Over the past few days a number of tube stations (including Kings Cross and Oxford Circus) across London have announced free Wifi access on their platforms. All it takes is a device which can connect to the internet and an email address to register with. It is expected that 80 underground stations will be able to provide the service in time for the upcoming Olympics and a further 40 by the end of the year. However, free access is only available for a limited time. The end of the Olympics will mark the end of free Wifi and from that point onwards only Virgin customers will be able to access the network without paying.