Sambar joined AT&T in 2002 as network operations manager and is a former SVP of FirstNet AT&T didn’t give a reason for his departure or share plans for a successor Sambar has been a big cheerleader for the D2D startup...

There’s a dispute over how the 4.9 GHz band should be managed for public safety Some public safety agencies want FirstNet to control the 4.9 GHz band; others argue for local control Verizon doesn’t want AT&T to get access to...