Turn off 3G/4GThe iPhone 3G and later models can take advantage the speedy 3G and 4G LTE cellular phone networks. But the functionality means that your smartphone will consume more power to get the quicker data speeds and higher-quality calls. In order to get more battery, turn off 3G or LTE and just use the older, slower networks.
Settings -> General -> Cellular -> Slide Enable 3G to Off on some models or Enable LTE to Off on the iPhone 5 or newer
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