just switch the headset on then put the phone on .
go to application or tools on your phone and switch the bluetooth on.
now select search for divce while you press the middle of the +and- switch on the headset for few seconds,your phone will find it .
now press connect on your phone if asked for pin enter either 0000 or 1234 it will pair definitly
good luck
the best/easy way is to use a plug and play adapter from PAC audio part # AOEM-CHR3
Non-navigation radios can utilize the PAC AOEM-FRD24 module. I have it in mine, gives proper 4-channel preamp output.
To pair an AOEM gw-bt-002 Bluetooth earpiece with a Sony Ericsson K850i, first ensure that the earpiece is in pairing mode, typically by holding down the power button until a light flashes. On the K850i, navigate to the "Settings" menu, select "Connectivity," then "Bluetooth," and ensure Bluetooth is turned on. Next, choose "Search for devices" to find the earpiece, select it from the list, and confirm the pairing by entering any required passcode (often 0000 or 1234). Once paired, the earpiece should be ready for use.