Prior to Everything Everywhere being formed and the amalgamation of Orange and T-Mobile within it, Three had an agreement with T-Mobile to share a certain amount of their network transmitters etc. The agreement between Three and T-Mobile resulted in MBNL, the network joint-venture being formed.

Now that to Everything Everywhere is official and in place, the deal with MBNL remains in place. This means that Three and T-Mobile share 12,000 3G sites around the UK.

The sharing of sites includes :  transmitters, base station equipment and backhaul connected to the operator's core networks, The result is greater 3G coverage. There are also cost savings because in addition to sharing the costs for the 12,000 3G sites another 5000 will be turned off resulting in a much larger saving.

A number of companies have supported the project and these are Ericsson, BT Wholesale, BT and Arqiva.