Grapevine Push-to-Talk is an “always on” solution that enables instant enterprise voice communication over a wide range of both enterprise rugged and consumer mobile devices. Grapevine is designed to work with either your existing cellular data connection or 802.11 wireless network. http://www.decisionpt.com/grapevine
On a wireless network, you might experience a lost Wi-Fi connection unexpectedly for no obvious reason. Here's why this might be happening.
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Find the best Wi-Fi network settings with this Android app. Are you having problems with your wireless network? Analysing the Wii-Fi signals could be useful in diagnosing problems and getting a better idea of how it works. WiFi Overview 360 is a free Android app that will do the job.