Droid Security a famous antivirus for android devices is now an AVG company and constantly improving day by day
About The Antivirus :
* Scan whole device and identify and remove viruses with a simpleclick
* Automatic scans can be run weekly, daily, or on demand
* Check apps for malware before downloading from app stores
* Check website content, emails, and SMS for malware before downloading to device
* Locate lost or stolen device using GPS
* Create and display message on screen remotely
* Lock device and wipe content
* Manage applications remotely
SMS Spam Protection
* Basic protection from SMS Spammers
Either you can visit android market on your device and search for ‘Droid Security’ to download the free antivirus or you can download the av to your pc from the below link and transfer to your device.
And once you like the free version any time you can upgrade to the paid version by visiting the link below
There you can also see the difference in both the versions and its highly recommended that you should install a good antivirus on all your devices running any kind of operating system because its only a myth that viruses are there only on windows devices,there are viruses for all kind of operating systems even its linux,mac,android or iOS.