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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.
Reduce auto-lock period to switch off backlight
Reducing how long it takes for your iPhone to switch its display off can help to considerably conserve battery life. When the smartphone is put down on a table, for example, it can take a minute or two — perhaps even longer — for the display to turn off. This means the display can quietly eat away at the device's battery life while it's not actively being used.
Go to Settings > General > Auto-Lock, then set this to 1 Minute or 2 Minutes, depending on your preferences. The shorter the time period, the greater the benefits to your iPhone's battery life.
Disable unnecessary vibrations
Vibrations are useful to enable, particularly when you're working in loud environments — or even very quiet ones — so you can leave your iPhone on silent and receive a buzz in your pocket when a new message or notification arrives. A physical motor spinning in your device causes these vibrations, but this uses up precious battery life. These can be restricted, or disabled altogether.
Go to Settings > Sounds and select whether you want to enable vibration when your phone rings, or if you want it enabled while it is set to silent.