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slider below to adjust the brightness manually.
Protecting Your Phone With Phone
Lock
You can protect your phone from accidental operations or
unauthorized use by enabling the phone lock. When enabled,
you need to touch the unlock icon and (depending on the
setting) enter a passcode to unlock the phone’s screen and
keys.
1. Touch the Home Key and swipe left to find the Settings app.
2. Touch Settings > Phone lock.
3. Touch Lock Screen to enable or disable phone lock.
4. If Lock Screen is enabled, touch Passcode lock to enhance
the security level by creating a four-digit passcode needed
when you unlock the screen and keys.