AT&T Launches Enhanced Push-To-Talk – Supported by Samsung Rugby III, Sonim XP5560 BOLT

AT&T today announced the availability of its Enhanced Push-To-Talk service, an update that adds a wide range of new features to its PTT offering. According to AT&T, Enhanced PTT works on 3G and LTE 4G networks and boasts faster call set-up times, presence indicators, and the ability to run on a wide range of smartphones […]