The volume bar doesn't show up
I have had my iPhone 4S for awhile, and this has never been a problem. Recently, I have noticed the volume bar will not show up regardless of what app I am using. I already tried resetting it and it didn't work. The do not disturb is turned off so I know that isn't the issue. Ive tried using headphones, plugging it into w charging dock and using bluetooth and it doesn't show up while using any of those. How can I fix this?
iPhone 4S