If for some strange reason your earbuds have become unpaired, here's how to pair them (with each other) again.
- On your mobile: remove previous links from; Settings-> Bluetooth --> (delete, forget...)
- Put the headphones in the case.
- On your phone: Turn off Bluetooth.
- Take both earbuds out of the case and double-click each earbud at the same time (double-click both at the same time).
- Look at the LEDs on the headphones. After a few seconds, the LEDs on one earbud will stop flashing (usually the left one) and the other will continue flashing.
- On your phone: At this point go to Settings->Bluetooth, find the headset and tap to connect.