my 4s will no longer flip to horizontal screen
My 4s 16G will no longer flip to the horizontal format?
iPhone 4S, iOS 8.4.1
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Check for 
in the status bar. If you see this icon, Orientation Lock is on. To turn it off, swipe up from the bottom of the screen to reveal the Control Center and tap .
If the screen doesn't rotate on your iPhone, iPad, or iPod touch - Apple Support