Nokia 820 has a black screen. How to delete the short messages in it?

Hello, wp8 Cookie. Com team will answer your questions:

If the screen of the mobile phone is not damaged, press and hold the screen lock key+volume reduction key to restart the deletion of the mobile phone. If the screen is damaged, try to clean it with a hard grid.

Hard grid method:

1. First, in the off state, press the power button for a short time to start the machine, press the volume reduction button for a long time after vibration, and then release it after 10 seconds (white exclamation mark will appear when the screen is normal);

2. Press the volume increase, volume decrease, power-on key and volume decrease immediately, and all the keys will be released.

3. The mobile phone will automatically restart. After a while, there will be gears turning on the screen. At this time, the mobile phone is really restored. In a few minutes, the mobile phone will become just activated in the factory. .

Please accept if you are satisfied, and ask if you don't understand!