GS Market is for users to download and install apps which are developed by Grandstream or 3rd party developers and certified to work on GXV3240/GXV3275 by Grandstream. The apps specifically for GXV3240/GXV3275 are maintained and updated in GS Market.
Bluedroid stack. The version is Android 4.2 official Bluetooth version.
Google Play is not bundled with the GXV3240/GXV3275 firmware by default. End users can choose to download and install Google Play from our GS Market. After Google Play is installed, users can download or purchase apps from Google Play as you would normally on any Android device. However, there is no guarantee that the apps from Google Play will work on GXV3240/GXV3275 if the application is not developed for GXV3240/GXV3275's screen resolution.
GXV3240/GXV3275 supports Bluetooth Class 2 - Maximum permitted power: 2.5mW, 4dBm - Range: ~10 m
GXV3240/GXV3275 supports Bluetooth version 2.0 + EDR -Data rate 3Mbit/s -Maximum application throughput 2.1Mbit/s
By default the GXV3240/GXV3275 has Screen Timeout set as 3 minutes, which turns the LCD screen off after the timeout. Users can manually configure the timeout interval from Settings -> Display -> Screen Timeout. When the screen turns black after the timeout, the MWI LED on the top right of the GXV3240/GXV3275 will be in light green if there is no other MWI LED indication.
There could be different causes. 1. The GXV3240/GXV3275 has "Use Random Port" set to "Yes". Please set it to "No" under web GUI->Advanced Settings->General Settings. 2. The 2 phones are not in the same LAN.