What does lock screen mean on iPhone?
The Lock Screen appears when you turn on or wake iPhone. It shows the current date and time, your most recent notifications, and a photo or any custom widgets you added.
How does lock screen app work?
You can set up a screen lock to help secure your Android phone or tablet. Each time you turn on your device or wake up the screen, you'll be asked to unlock your device, usually with a PIN, pattern, or password. On some devices, you can unlock with your fingerprint.