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Apple mobile phone can't hear the sound. What happened?

Maybe the volume is too low. Just turn up the volume of your mobile phone. If there is no problem with the volume of the mobile phone, it may be that there is no recording permission to open WeChat. Just open the permissions on the phone. The specific operation is as follows: 1. Open the settings on your phone, slide down in the settings interface to find privacy, and click Enter. 2. Click to enter the microphone. 3. Just open the microphone permission of WeChat in the new interface.