Each network will now embark upon the legal processes to start operations as a joint venture, which will make the new company the largest UK mobile operator.
The European Commission (EC) cleared the joint venture after both parties agreed to give up 25% of its 1800MHz spectrum to be re-used on the next generation 4G, or LTE, networks.
The network sharing agreement between T-Mobile and 3 will also remain, much to the relief of 3. This ensures that the deal to give T-Mobile and 3 well over 10,000 3G base stations and greatly increased data capacity by October 2010 continues, with further expansion in 2011 and beyond.
No more information is yet available, such as the likely name of the joint venture, its launch date or tariffs etc.