Phone Manager Mobile will automatically detect whether you are connecting from inside the office or externally. If at any time Phone Manager has a problem connecting to the server then a message will display at the top of the screen as shown below:
The most likely cause of this message is that the mobile phone has no data connection with which to connect back to the server. When this happens the following features of the application will still be available:
All other features will be restricted until a valid connection to the server can be established.
If this is the first time connecting then check the Installation steps for the relevant device type
Mobile Installation on Android