The process of setting up a Bluetooth network is referred to as "pairing," because the network consists of just one "pair" of devices. Although it is often possible to pair one device to multiple other devices, each connection is secure and unique to one particular pair of devices. In order to successfully pair a cell phone to a car stereo, both the phone and the head unit must be Bluetooth compatible. The exact process of pairing a phone to a car audio system varies depending on the specific phone and the way the infotainment or audio system is set up. Most of these steps will translate in one way or another regardless of what type of phone you have, and the car you drive, but the first step, in any case, is to make sure that you're working with the right tools. With that in mind, the first step to pairing a phone with a car stereo is to verify that your phone actually has Bluetooth. You can go ahead and turn your phone on at this point unless it was already on since you'll have to either dive into the menus or dig out your owner's manual to verify that you have Bluetooth.