Have you tried rebooting your phone? This can be done in a couple of different ways depending on what phone you have. iPhone 6 and earlier, press and hold the power button and the home button till you see the apple logo at which point you can release both buttons. If it's an iPhone 7, press and hold volume down and power button till you see apple logo, then release both buttons. iPhone 8 is a little more tricky in that you have to press volume up, then volume down, then press and hold the side button (power button) till you see the apple logo. Once you see the logo, then you can release the side button.
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