If you're using a car's infotainment system with Bluetooth connectivity, you may need to disable hands-free telephony through the car's settings. The steps will vary depending on the car's make and model, but here are some general instructions:
When you pair Bluetooth headphones, Windows creates two profiles: (high-quality audio) and Hands-Free Telephony (low-quality, two-way call audio). Disabling the latter forces high-quality mode. disable hands free telephony
Apple does not allow disabling just the hands-free profile. You have two options: If you're using a car's infotainment system with
: The device will no longer receive or handle calls, preventing automatic switching. Apple does not allow disabling just the hands-free profile
When a Bluetooth device connects with HFP enabled, the audio stream is often compressed to support bidirectional voice communication. This generally results in a lower bitrate ("telephone quality" audio) compared to the Advanced Audio Distribution Profile (A2DP), which is used for high-fidelity music streaming.