I'm pretty sure I know the answer to this question, and I'm pretty sure it's the disappointing one. On an un-jailbroken iPhone, is there an easier way to enable/disable the Bluetooth on an iPhone than ...
Apple wants you to avoid damaging your hearing when you’re using an iPhone or iPad (but, strangely, not a Mac). In Settings > Sounds & Haptics > Headphone Safety, enable Reduce Loud Audio, and you can ...