Low-band spectrum boosts cellular coverage inside buildings and in rural areas. It also has the ability to travel greater distances than high-band spectrum, making it a more efficient way to provide coverage at the edge of cities and in less densely populated areas.
T-Mobile US, owned by Germany's Deutsche Telekom, plans to roll out service and compatible phones as early as the fourth quarter of 2014. The deals are expected to close in mid-2014 and remain subject to regulatory approvals.
(Read more: Japan's SoftBank in talks to acquire T-Mobile: Sources)
—By The Associated Press