People traveling through the Channel Tunnel can now access mobile services 100 metres under the sea -- as long as they are heading to the U.K., rather than crossing over to France.

French operators Bouygues Telecom, Orange and SFR have all started providing 2G and 3G services in the south tunnel -- which runs from France to the U.K. -- enabling passengers and drivers on the Eurostar, Shuttle and Freight service to use their phones under the English Channel.