Bluetooth is wonderful, letting you wirelessly stream music and calls to compatible speakers (whether portable or automotive), and sync up with everything from wireless headphones to external keyboards. Bluetooth is also, unfortunately, one of the biggest power drains of all, as the phone constantly pings its surroundings to either maintain a connection, or search for new ones. And while it used be to a hassle to quickly toggle Bluetooth on and off, current versions of Android and iOS learned their lesson, requiring a single swipe (from the bottom or top of nearly any screen) to bring up a limited settings menu, and a single tap on the Bluetooth icon (the sideways Space Invaders-looking fellow) to activate or deactivate.
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