March 31 : AT&T has reached a deal to invest about $1 billion to improve the Commerce Department's FirstNet and deliver $1 billion in cost savings for the program via reduced rates, a U.S government agency said on Tuesday. The telecommunications company was awarded the 25-year contract to build the federal emergency cellular network FirstNet in 2017, years after a federal commission recommended setting up such a system following the 9/11 attacks. The system, which helps first responders such as