My iPhone 4 has no volume

2 days ago out of the blue my phones volume went away?! I was texting and clicked the button on the side to turn my volume down and it was gone! I checked my settings and the change with buttons is on. It's only there when I'm talking on the phone. The ringer works though. Even when I try and watch videos or listen to music it's not there. When when my headphones are in it still doesn't work:/. What can I do please help?

Go to Settings>General>Accessibility>Assistive… And turn it on. A white dot will appear on your screen. Click on it and then device. Now turn up your volume there. Also, check if its one vibrate and if all the sounds are off on the settings menu as well.

Check the mute button above the volume button in case you hit that.

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