It's great that today's phones have LTE, GPS, Wi-Fi, and Bluetooth, but do you really need all four activated 24 hours per day? Android keeps location-based apps resident in the background, and the constant drain on your battery will become noticeable, fast. Some 4G and 4G LTE smartphones let you turn off 4G mode separately, which is a good thing, since LTE consumes extra power but has yet to blanket the country. If your phone has a power control widget, you can use it to quickly turn on/off GPS, Wi-Fi, and Bluetooth, and sometimes 4G as well (depending on the phone).