to 18 Android attacks and the remainders target other smartphones OSs. Moreover all the mal wares for iOS targeted jailbroken iPhones (we will see jailbreaking in details in section 4.2). This gives indication about the number of mal wares in our two OSs. The authors also stated that the permission-based, which is a main Android defense technique; need more attention by the increasing number of attacks compared to consider the iOS human reviewing as an effective mechanism against the malwares. In [33] the authors evaluated the security of different smartphones OSs in terms of messaging applications. iOS and Android approximately allow the using of all applications they evaluated. This makes them both vulnerable to set of attacks advantage from the messaging applications gaps. The authors praised iMessage tool in iOS as a defense for such attacks