Mobile Phone LG L70 and plantronics bluetooth

i have a Mobile iphone model LG L70 and also an old Plantronics headset Model 05-12RIE.  I am trying to pair my iPhone with this headset, but my iphone does not seem to discover it.  I switched on the bluetooth Plantronics, the lights went from red and then when I pressed again, it turned blue.  then on the iPhone I switched to the Blue tooth and switched it on, and tried to search for this bluetooth, but it could not find it.  Maybe I am doing it all wrong or the steps, and hope the experts can please point me in the right direction, especially if there is a video on how to do it.  Thank u.
Jegajothy vythilingamretiredAsked:
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Natty GregIn Theory (IT)Commented:
Head set needs to be reset to factory since it was previous sync to another device, then you was to set the Bluetooth to pair mode for your device to find it.

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Jegajothy vythilingamretiredAuthor Commented:
thank u.
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