To check the status of the remote device just go to the Keep Close Contact dashboard and the status is shown. 

The iPhone icon is

• green when the remote device is connected
• orange when the status is unknown 
• red when it is disconnected

The lightning bolt icon is

• green when the remote device is plugged in to power
• orange when the status is unknown 
• red when the device is unplugged from power

The envelope button is 

• blue when there are no messages waiting for acknowledgement
• orange when a message has been sent and you have asked to know if it has been acknowledged
• red if a message has been sent and it has not been acknowledged in the time you requested