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Apple 13 Why are some SMS messages muted?

It is caused by the cable failure of the mute key switch.

The mute button is used frequently, and the mobile phone has been dropped several times without being held, resulting in loose mute button and poor internal contact, and the mute button is in the middle of the two modes.

During the warranty period, it is recommended to go to Apple's official after-sales warranty. If the warranty period expires, you can consider repairing it. All models of this wired iPhone are generally under the motherboard, so it is necessary to disassemble the battery, motherboard and volume button to change clothes. The process is complicated, so it is not recommended to disassemble and replace it yourself.