20 Most Recent Jabra BT620 BLUETOOTH STEREO HANDS-FREE HEADSET Headset - Page 7 Questions & Answers

Not sure if you have provided the correct model. You need to pair the headset with the corresponding mobile phone and then accept the calls. Refer this table on the link and select the correct Jabra model and the mobile phone model and you will find the correct instructions. Bluetooth Pairing Guide

Hold the power button down until it either beeps or the indicator light stays lighted (this usually indicates pairing mode, might want to check manual to verify). Once headset is in pairing mode, go to phone's blue tooth settings and choose "pair" or "search for devices". This is pretty much the standard method for pairing devices using BT technology.

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call HP service center to check for hardware and software compatibility.