As the needs of humans are rising, the technology is also growing tremendously, with the adverse necessity in day to day life for the usage of latest technologies mobile phone ranks top in the list. Such ubiquitous computing has several benefits, which also saves a higher intensity of time. With the increased connectivity facilities provided by the smartphones. Every citizen tends to use those facilities. Therefore these smartphones provide an ideal target for the hackers. The giant operating systems so far popular among smartphone users is ANDROID, which is an open source operating system. The next flagging operating system is ios. The malware writers tend to code for android comparatively. Thus these fly rocketing technologies must be targeted for their safety rather than for their usage. This paper provides an overview of the major reasons for threats in ios and Android operating systems.