If you’re having trouble finding your Bluefruit device in the scanned peripherals list, it could be due to caching isues in the iOS or Android operating system. For a fix, try the following:

Cycle Bluetooth

Turn your mobile device’s Bluetooth radio off and on again via your device's Settings app.

Cycle Power

Restart your mobile device by powering it off and restarting.

Clear Bluetooth Cache

On iOS, go to Settings->Bluetooth, tap the i button, and tap forget device. For Android, instructions can be found here.