If you have a vehicle with "enhanced" or "premium" Bluetooth support, your Android phone may or may not have supported that protocol, known as rSAP, to date. If you had a Nexus handset, it definitely didn't (unless you used some kind of root rSAP profile solution), because the functionality wasn't built into the Android OS. rSAP, for the record, allows you to connect your vehicle to a mobile network over Bluetooth using your phone's SIM card to authenticate against, allowing things like in-car Wi-Fi hotspots, connectivity to in-car apps requiring mobile data, and potentially other features depending on the brand of car.

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