For users who have just started using the touch screen phone, would feel automatic screen rotation a bit comfortless. This automatic screen rotation is much sensitive that even when you tilt your phone a bit horizontal the menu changes horizontal (of course this is how the phone is expected to behave). Here are some steps how to turn off this feature,
1. Go to the menu screen
2. Select Settings
3. Select Phone
4. Select Sensor Settings
5. Select Turning Control
6. Uncheck the box Auto-rotate Display
You can get back this feature by following the same steps by marking the Auto-rotate Display.