The most common annoying issue for smartphone user is device lagging and slowness. Everyone hates slow device.

Clean master is free tool which deletes junk files, as a result device performs better, discard unwanted cache and create more storage space.

This application also provide free antivirus which blocks and remove viruses also keep safe from Trojans .

Here is URL:
https://play.google.com/store/apps/details?id=com.cleanmaster.mguard&hl=en

Also Read: Play YouTube video in background on android smartphone.