You can quickly set a countdown by long pressing on the timer icon in the control center.
Quickly set a countdown by long pressing on the timer icon
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How to Switch between the last used apps
You can switch between the last used apps by swiping on the bar at the bottom of your phone.
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10 iPhone Gestures and Shortcuts You Should Know
Essential iPhone shortcuts including back button navigation, three-finger gestures, cursor control, and text replacement