If you get a lot of notifications during the day, you can actually save a bit of battery life by leaving your iPhone face down on a table or other surface. Face-down detection is a subtle feature that Apple snuck into iOS 9 last fall to save a bit of power on modern iPhones by not lighting up the screen whenever text message notifications come in — after all, the screen is one of the biggest power consumers on the iPhone, and since you can’t…
