HOW TO TURN ON AN IPHONE
1. Locate the Power button. This is also referred to as the "Sleep/Wake" button. The button location varies depending on your iPhone model:
iPhone 6 and newer - You'll find the Power button along the right side of the phone, towards the top.
iPhone 5 and older - The Power button can be found along the top edge of the phone.
2. Press and hold the Power button. If the iPhone is already on, the screen will wake up and you can unlock the screen. If the iPhone is off, you'll need to keep holding the button until you see the Apple logo.
3. Release the Power button when the Apple logo appears. The Apple logo indicates that your iPhone is loading. It may take a minute or so before your lock screen appears.
Unlock the screen. After booting up, you'll have to unlock the screen before you can start using the iPhone.
iPhone 5 and newer - Press the Home button to unlock the screen, and then enter your passcode if you have one enabled.
iPhone 4s and older - Slide the screen to unlock it, then enter your passcode.
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