Allow phones connected via USB to play lossless music from the phone (not using Bluetooth).
Bluetooth is not an adequate way to listen to high-quality music files from your smartphone – a direct cable-based connection to the onboard audio system would be a better solution to listen to your music. Simultaneously the smartphone would be charged 😉
For the iPhone, it may require custom software and a license from Apple. Part of the issue is Apple’s use of DRM for some music.