CM Security is considered the best Android security app. It is lightweight and its scanning process is pretty fast. After finishing a scan, it lists the results of the virus scan, sms phishing vulnerability and the status of system protection. In addition, it includes a privacy advisor to identify the apps that can access your private info.This app offers various settings including scheduled scan, ignore apps list, real-time protection, safe browsing, auto-update definition, etc. Some other handy features are also available right from the menu such as Scan SD Card, Clean Up Junk, Memory Boost and Call Blocking.