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Disable 4G (and LTE) connectivity
While 4G is faster than 3G cellular connectivity, it also uses a lot more battery power. Long-term evolution (LTE) uses an entirely different hardware radio and often drains the battery even quicker. When not using high-bandwidth applications, streaming videos, or tethered to a laptop or tablet, you can disable 4G and LTE connectivity altogether. You'll receive slower download speeds (albeit still rather fast by modern standards) but it will also help conserve your iPhone's battery throughout the day.
Go to Settings > Cellular, then switch off the Enable 4G (or Enable LTE on newer models) button.