We are currently experiencing delays with our email service, which may affect logins and notifications. We sincerely apologize for the inconvenience and appreciate your patience while we work to resolve the issue.
Avast is the best free antivirus solution, you can even use facebook login and track your devices and reports online easily.
http://www.avast.com/get/YxEpUBPJ
Apanzee is right, malware on mobile phones are mainly due to the user installing an app without reviewing the amount of access you're giving said app. Some good tips or general info about Android security: http://www.androidauthority.com/secure-android-90523/