Dive Summary:

• AT&T is offering a smart-phone application that allows as many as 250 users to have voice contact in less than one second, a revival of the days of push-to-talk connectivity.
• The downloadable application for phones that use the AT&T network, allows users to create groups and indicates whether another user is using the app and is available.
• AT&T's timing for the phone feature coincides with a deadline the Federal Communications Commission has set for conventional two-way radio in the VHF and UHF parts of the spectrum to either revamp to what is know as narrow-band technology or shut down.

From the article:

Push-to-talk communication has been around since two-way radio came into use more than 70 years ago. Now, AT&T is putting a new spin on the sub-second communication feature with an enhanced push-to-talk service that can instantly reach up to 250 people simultaneously. ...