IPhone 4S suddenly lost its sound. The incoming bell rang and the call was normal. What if there is no sound when listening to songs and watching videos?

Many people will encounter the problem that WeChat voice has no sound when using Apple mobile phones. Now everyone recommends restarting, resetting WeChat, or resetting Apple, but sometimes all three methods have been used and it doesn't work. I personally encountered this problem. Later, I took off the phone cover and wiped it, especially near the volume and receiver, which was ok.