What should I do if I fail to unlock my phone with the band?

Put the band close to the mobile phone. To ensure privacy, the phone can be unlocked only when the band is close to it. 2) Restart the mobile phone Bluetooth, wait for the band to reconnect with the phone, and then check whether the band's unlock feature is restored. 3) Reset the screen unlock. Find the Bluetooth unlock in the mobile phone system settings, search the "Amazfit Band 2" device under the device list, click and delete the device, and then reset the screen unlock in the Amazfit App.  If the above solutions do not work, please restart your phone.