Is there any available screen lock utility for Nokia Asha 311 aside from its default screen lock?
Yes, there are some screen lock utilities available for your Nokia Asha 311. One of them is Phone Locker developed by Ngugi Tech. You can download and install it using your phone browser. Also, you can install Custom Lock Screens or Screen Locker Info which will help you to find information about different kinds of screen lockers for your device.