Try pairing with the mobile using the steps mentioned, if this doesn't work proceed with the next step
5.1 Unable to find Bluetooth name in the NoiseFit app upon pairing
Check that you have performed the right steps to start the pairing.
Restart your phone or disable and re-enable the Bluetooth on your phone, then re-pair the watch with your phone.
Restart the watch, then re-pair it with your phone.
Re-install the NoiseFit app, then re-pair the watch with your phone.
If the watch is paired with other devices , unpair it from the other devices, then re-pair it with your phone. If the original paired device cannot be found, try re-pairing the watch in a relatively less disruptive environment (such as an open outdoor area with fewer people).
Restarting your mobile device gives it a fresh start and is sometimes all you need to fix your issue.
5.2 Noisefit app prompt me "Pairing failed"
Re-install the Noisefit app, and then re-pair the watch with your phone.
If the watch's name is not visible on BT search result, Try pairing with a different mobile
5.3 Unable to connect phone after disconnection
Check that your watch and the Noisefit app are fully updated.
Turn on Bluetooth and GPS on your phone and grant the Location permission for the NoiseFit app.
Open the NoiseFit app and check to see if your watch can connect automatically.
If the watch can connect automatically, this issue may have occurred because the NoiseFit app is prevented from running in the background. If you are using an Android phone, you need to add the NoiseFit app to the protected list in the background. If you have installed third-party phone manager apps on your phone, add the NoiseFit app to the white list using the apps.
If your watch cannot connect automatically, connect them manually. To do this, open the NoiseFit app, go to Devices, and then go to Pair device.
If this issue persists, perform the following to troubleshoot: