It was announced that AT&T, Verizon, and T-Mobile forged a pact with the Department of Defense to explore the possibility of sharing 95 MHz of spectrum located in the 1755 - 1850 MHz band. It looks like Sprint didn't got involve with the pact. I wonder how this will impact wireless competition.
Source: http://www.fiercewireless.com/story/att-verizon-t-mobile-forge-pact-explore-spectrum-sharing-government/2013-01-31