If you've ever played a video on your Android device and turned it sideways, only for the video to remain stubbornly in vertical orientation, you may wonder why. But don't panic, as there's most ...

Check if the Portrait Orientation Lock is on; it stops the iPhone screen from rotating. Open Control Center and tap the lock icon to turn off rotation lock if it's active. Some apps don't rotate; test ...

Since the launch of the very first iPhone, every single model that followed — not to mention just about every other smartphone in existence — has had a rotating screen feature. It's simple in its ...