I frequently turn my phone on silent while I'm at work and then forget to turn silent mode off when I get home. If this is also you, or if you have a hard time hearing your alerts, you may want to set your LED flashlight to light up every time a new message or alert comes in.
To turn on this feature, go to Settings and select General>Accessibility. Then scroll down to the Hearing section, and toggle LED Flash for Alerts to On.
You might want to consider turning this feature off before going to the movies though...
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