How do i fix the sound on an iPhone 4S? When i play music the sound bar at the bottom disappeared and when i try to adjust sound with the buttons on the side, nothing happens. Also the sound in my apps is not working.

The sound isn't working. And it also does not appear, when i try to adjuct it with the buttons the sound bar doesn't appear and when i try playing music at the bottom the sound bar disappeared. How do I fix this?

Basic troubleshooting steps clearly outlined in the User Guide are restart, reset, restore from backup, restore as new device.  Have you gone through ALL of these troubleshooting steps?
If you have gone through all the troubleshooting steps and you're still having problems, you'll need to bring your phone into Apple for evaluation.

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