Activate multipoint by pressing the Call button on the headset and sliding the on/off switch to the on position. Release the Call button when the LED flashes red/blue.
Activate the Bluetooth feature on your phone, then use the phone's settings to add/search/discover new Bluetooth devices.
iPhone: Settings > General > Bluetooth > On (starts the search for devices).
Android™ smartphones: Settings > Wireless & Networks > Bluetooth: On > Scan for devices.
Select 'PLT_ML18' or 'PLT_ML20' from the list of Bluetooth devices shown on your phone. If phone asks for a passcode, enter four zeros (0000). Some phones also ask to confirm headset connection after pairing.
Headset LED will stop flashing red/blue once successfully paired/connected.