T-Mobile US, Inc. (NASDAQ: TMUS) and Crown Castle International Corp. (NYSE: CCI) have signed a new 12-year agreement to support the continued build-out of T-Mobile’s US 5G network with increased access to Crown Castle’s towers and small cell locations.

The agreement enables the Un-carrier to further expand and deepen the reach of its 5G network to serve consumers across the US while also realising financial synergies following its merger.

The agreement also helps Crown Castle generate long-term tower and small cell revenue growth, the group said.

Neville Ray, president of Technology at T-Mobile, said: “T-Mobile’s expanded alliance with long-term partner Crown Castle will fuel acceleration of our nationwide network build and provide synergies that we can further invest into that build – all in support of our Un-carrier mission to truly deliver 5G for all.

“This agreement is another integral piece of T-Mobile’s ongoing efforts to rapidly expand what is already America’s largest 5G network. We will not stop focusing on reaching even more customers and delivering fast 5G speeds to more people – every day and into the future.”

Also commenting, Jay Brown, Crown Castle’s chief executive officer, added: “We are excited to build on our long-standing strategic relationship with T-Mobile as we work closely with them to continue to deploy their next-generation 5G network.

“T-Mobile and Crown Castle are ideal partners for this next phase as wireless network architecture continues to densify. We believe T-Mobile’s significant long-term commitment to utilise our comprehensive infrastructure consisting of towers, small cells and fibre will enable our collective teams to quickly meet future network demands.”

Crown Castle owns, operates and leases more than 40,000 cell towers and approximately 80,000 route miles of fibre supporting small cells and fibre solutions across every major US market.