For improved productivity and efficiency, many organisations are adopting POC Push to Talk over Cellular (3G/4G/Wi-Fi networks) which provides instant communication with National and International coverage. A significant advantage of PTT over cellular is the ability for a single person to reach an active talk group at the push of a button; users do not need to make several telephone calls to coordinate with a group. Push to talk cellular calls provide half-duplex communications — while one person transmits, the other(s) receive. This combines the operational advantages of PoC on a single smart device.