Go to the Wi-Fi settings in the SatSleeve Hotspot app and tap the Wi-Fi off button, you will then be disconnected from the smartphone and the App.
For incoming calls: the SatSleeve unit will give you a vibration alert when an incoming call is coming through and you can pick it up by pressing the SOS button. To disconnect the call, press the SOS button again.
For outgoing calls: the SOS button can be used to call one pre-programmed number of your choice.
Please note: to turn on the Wi-Fi functionality again in order to reconnect to your smartphone, please turn the SatSleeve unit off and then on again.