Ryan12

When iPhone has no sound, you could first check out these small tips. Firstly, see whether you turned on Do Not Disturb or Airplane mode. Then force restart your iPhone and see if the Bluetooth is switched on. If your iPhone still has no sound, then possible ios system bugs could be the reasons. In such as case, you are suggested to use professional ios repair tools such as TunesKit iOS System Recovery. Or you could go to the Apple center for advice.