NextWave holds licenses in the Wireless Communication Services (WCS) and Advanced Wireless Service (AWS) bands.

ENGADGET: AT&T agrees to acquire NextWave for $600 million, gobbles up WCS and AWS spectrum

For years push-to talk has been a function available from Nextel (nasdaq: NXTL - news - people ), the wireless-service provider best known for catering to businesses where instant communication is useful.

FORBES: The Push-To-Talk Push