Please, try following the subsequent advice.- Turn brightness of the screen to max- Make sure BT is turned on- Tap the sensor (and see the white light flash once) and place sensor on phone face down.- For some android models a notification is triggered and the phone asks for permission to connect a new device. The user will hear a notification sound, and when you pull down the notifications from the top of the screen you will see the phone asks permission to connect to the SunSense bluetooth sensor. If the sensor still won´t connect, please contact us at support@sunsense.com