If none of these options work....go to Settings > Sounds.....right below Ringer and Alerts is "Change with Buttons". If that is turned off....your volume buttons on the side of your phone are inactive and the reason why it doesn't show on screen or work
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Volume buttons or ringer not working in Iphone
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Manoj Pandey
26-Mar-2015If none of these options work....go to Settings > Sounds.....right below Ringer and Alerts is "Change with Buttons". If that is turned off....your volume buttons on the side of your phone are inactive and the reason why it doesn't show on screen or work