i had the same trouble with mine but found info on sony support page.
Make sure that the headset is fully charged, switched on and within 1 m
(3 ft) of the phone.
The first time you turn your headset on, it immediately goes into
pairing mode. after beeps finish follow instructions below.
To manually prepare the headset, press the VOLUME BUTTONS, (+) and (-),
at the same time for approximately 5 seconds until your hear a long high
frequent beep and the light flashes red and green. The headset is now in
“Pairing mode”.
use code " 0000" when pairing to your phone.
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