How can I enable Bluetooth in my Audi A4?

I recently purchased a used Audi A4 and I'm having trouble connecting my phone via Bluetooth. Whenever I try to enable it, it says 'Bluetooth unavailable'. How do I fix this issue?

First, make sure your phone is compatible with your Audi's Bluetooth system. Then, try resetting the system by pressing and holding the 'Setup' button for 10 seconds until the LED flashes. If the issue persists, try updating your Audi's software through the dealership.

Another potential solution is to restart your phone and then try enabling Bluetooth again. Sometimes, a simple reboot can fix connectivity issues.

You may also want to check if your phone's Bluetooth is turned on and in discoverable mode. If it is, try deleting your Audi from your phone's list of connected devices and then reconnecting it.