Eurostar and Le Shuttle will now be able to make calls and access the internet while travelling from the UK to France following the signing of a new deal with phone operators EE and Vodafone.
The North Tunnel will now follow in the footsteps of the South Tunnel which has had similar agreements already in place with French mobile operators, Bouygues Telecom, Orange and SFR since 2012.
Under the 10-year deal, customers will have access to 2G and 3G services, with plans to eventually offer 4G data services in the future.
Announcing the agreement, Eurotunnel said: “Providing such a wireless service 100 metres below sea level for the 20 million passengers who travel through the world’s longest undersea tunnel each year is a first.
“In order to deliver this service, Eurotunnel and its partners have overcome a series of technical challenges: the work was conducted without disruption to railway traffic, in a confined environment under stringent safety conditions.”