360 security is one of the best mobile antivirus

Free Security Protection and Speed Booster for Android Phone
Protect your mobile device with 360 Security, a top of the line mobile security app designed to protect your android phone against the latest viruses, malware, system vulnerabilities, and privacy risks.It also cleans application caches and junk files from your system,increases the available storage space on SD card and boosts your android phone.

 Owener : Qihoo 360 (NYSE:QIHU)