A. 1. Ensure Bluetooth is enabled on your Android device. Go to Settings > Bluetooth and toggle it on. 2. Restart both your smartphone and the NoiseFit device. 3. Forget the NoiseFit device in your phone's Bluetooth settings and re-pair it. Go to Settings > Bluetooth, tap on the NoiseFit device, and select 'Forget'. Then, re-pair it by selecting the device from the list again. 4. Check for any software updates for both your smartphone and the NoiseFit app. Update if necessary.

B. 5. If issues persist, try resetting the NoiseFit device to factory settings. Refer to the user manual for instructions on how to perform a factory reset.