If you’ve got an Android smartphone running Android 5.1 lollipop eg Infinix Hot 2, you can easily make the phone stay in portrait mode all the time if you don’t like the the phone’s screen to be auto-rotating, by making use of the built-in auto-rotate toggle.
Under Quick Settings on your Android 5.1 running device, there are toggles for Wi-Fi, Bluetooth, Flashlight and Airplane mode. You should also see the auto- rotate toggle there by default. Just tap on it to lock screen rotation.
You can also stop the screen of your Android Infinix hot 2 from auto rotating by navigating to “Settings” > “Display” and set “when device is rotated” to “stay in portrait view”
Go to “Settings” > “Accessibility” and toggle “Auto-rotate screen” OFF.