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What is the black screen of Apple SMS?

Apple mobile phone has a black screen. You can use the method of forced restart first, and press and hold the HOME key and the screen lock key 10 second at the same time to solve the problem of cell phone crash. You can also plug in a charger. If the charging screen is displayed on the screen, it means that the battery of the mobile phone has started the under-voltage protection, and it usually takes 15-20 minutes to turn it on.