How many of you leave on the Bluetooth on your iPhone all the time? I am very curious about how much power Bluetooth uses. I did some light research and read that Bluetooth LE (low energy) uses very little power, but I am unsure how to quantify that in terms of real life use. Other questions: if the Bluetooth icon is visible in the menu bar at top, does it use the same amount of power whether it is grayed out or black? And how easy is it for someone to hack your device when Bluetooth is on? If it's not obvious, I'm asking all these questions because I'm wondering if I should only turn on Bluetooth when I need it. With some iOS features like Continuity and Airdrop, however, I feel inclined to leave Bluetooth on all the time. thanks in advance all!