Your iPhone or iPad has stopped changing the orientation of the screen? We hasten to please you, in the overwhelming majority of cases, this problem is not a hardware problem. Solve it will help described in this instruction ways.
Check if both modes support
Initially, you should check the simplest possible reason that the iPhone or iPad screen does not rotate. It consists in the fact that an application in which a mobile device is “stuck” in landscape or portrait mode simply does not support both orientations. To test the rotation of the screen is easiest in the standard “Calculator” application. Run it and try rotating the device screen.
Disable Orientation Lock
Next, you need to make sure that the screen lock function is disabled. To do this, open the Control item (svayp from the bottom of the screen) and press the control button to lock the screen orientation.
IPhone or iPad screen does not rotate – what to do
Slide the switch on the sidebar to a different position (iPad only)
On iPad tablets, the screen orientation can be locked by the switch on the side panel. If the option “Orientation lock” is active in the “Settings” → “Basic” menu in the “Switch on the sidebar” section, you only need to move the switch to another position in order to change the orientation.
Turn off the zoom function (only for 5.5 inch iPhone)
On iPhone 6 Plus, iPhone 6s Plus and iPhone 7 Plus, the screen orientation change function may not work due to the active screen zoom option. Go to the “Settings” menu → “Screen and brightness” → “View” and check the box “Standard”. After that, you can again change the orientation of the display.
If the above methods have not helped you, it remains to hope for some kind of non-standard error in iOS. To cope with it can help a forced reboot, which requires you to hold down the Power and Home buttons (the volume down button on the iPhone 7 and iPhone 7 Plus) and hold them until the Apple logo appears on the screen.