A new deal signed between T-Mobile, 3 and BT Wholesale will give the two mobile broadband providers an improved UK network.
BT will provide high-speed links between the data stations used by T-Mobile and 3 after a multi-million pound contract was recently signed.
The agreement follows BT Wholesale's previous similar deals with Vodafone and O2 and now means that Orange is the only major mobile broadband provider without such a contract.
"This agreement with BT will make sure backhaul [the backbone connections of the network] is not a constraint now or in the future at a time when T-Mobile is experiencing strong growth in mobile broadband and other mobile data services," said Emin Gurdenli, technology director at T-Mobile UK.
While Brian Fitzpatrick, managing director of BT Wholesale Markets, commented: "BT now supports the base station connectivity requirements of four of the five mobile players in the UK market."
It is said that the development is good news for BT Wholesale, which had seen dwindling revenues recently.