If you try to reconnect with an already paired nemonic, the message ‘Check if nemonic is turned on & within device range.’ may appear.
In this case, go to the Home > Settings > Bluetooth menu on your iPhone or iPad, delete the paired nemonic and reconnect it.
Delete the device list by going to My Device list on the Bluetooth menu, pressing the already paired nemonic’s (i) button and selecting [Delete this device]. Re-pair nemonic to your device by searching & selecting it again.