• check sure your iPhone isn't on overdrive mode. When you're not using it, turn off background refresh, automated downloads, unimportant push notifications, Bluetooth, and cellular data. You may check your battery usage to discover which apps are draining it the most (Settings Battery). Also, check the health of your battery (Settings Battery Battery Health).
• A reset is generally enough to fix an unexplained white screen of death. If it doesn't work, a hard (factory) reset and a boot into DFU (Device Firmware Upgrade) mode may be necessary.
• Turn on Assistive Mode under Settings Accessibility Assistive Touch if your volume button stops working. From your home screen, you may adjust the volume and go to silent mode.
• If you find your iPhone in a Titanic-like situation, dry it immediately with a towel and keep it turned off. Any circuit that is damp is the last thing you want to happen.

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