I am using iPhone 4 16gb and i want to pair it with bluetooth Plantronics Discovery 975 for safe drive. I tried to set up it but my iPhone does not detect any device through bluetooth "setting > General > Bluetooth > On then the iPhone starts to search Devices and its continuing to search in screen i can see "Searching ..." and down side "Now Discoveravle" but more than 2 hours i tried its continued to search it did not find any device. My Earphone Pantronics Discovery 975 is on. I charged it and on keep it together with iphone. Please help me how to install bluetooth to my iphone. Please help me.