Nextel Communications, Inc. was a wireless service operator that merged with and continues to exist as a wholly owned subsidiary of Sprint Corporation. Nextel mobile communications in countries like Argentina, Brazil, and Mexico, are part of NII Holdings, a stand-alone, publicly traded company that is not owned by Sprint Corporation. Nextel Communications traces its roots to the 1987 foundation of FleetCall by Morgan O'Brien, Brian McAuley, Chris Rogers, and Peter Reinheimer.