Refer to “Setting up PeriCoach” in the Instructions for Use for how to connect the phone and sensor. If you are still having trouble, you may need to pair the phone and probe using the phone settings: Go to Bluetooth in your phones settings – Settings > Wireless and Networks > Bluetooth > Bluetooth Settings Select Scan for Devices (ensure probe is in Bluetooth discoverable mode) Find and select PeriCoach-12345678910111213 (number will vary) Select Pair when prompted. Once sensor is paired, return to PeriCoach app and open. Select Connect to Device. Sensor should now connect, and message on app home screen should read PeriCoach: Connected.