Based on the news early this year, there are more than 300000 Android devices are infected by so called "Premium SMS-Sending malware". The "Premium SMS-Sending malware" will send SMS to premium numbers automatically & secretly. What you get at the end is the extra charge in your mobile phone bill!! So how can you stay away from this kind of malware? The easy way is to avoid download Android apps from sources other than Google Play. The even easier way is to install Super Security & Antivirus https://play.google.com/store/apps/details?id=com.supersecurity Give it a try!