Android users may have some cause for concern. Considering its surging popularity, there is going to be a certain amount of rouge applications and other malware that targets the top iPhone OS. According to the popular anti-virus maker, Trend Micro, there are at least 20,000 applications that are malicious that target Google's Android OS. That is an increase of at least 400% since the beginning of 2012. By Christmas of this year, experts have given a conservative estimate that puts potential malware and rouge apps at around 150,000 different applications.