The iPhone can enlarge text to make it more accessible for vision-impaired users,and can accommodate hearing-impaired users with closed captioning and external TTY devices.The iPhone 3GS also features white on black mode, VoiceOver (a screen reader), and zooming for impaired vision, and mono audio for limited hearing in one ear.Apple regularly publishes Voluntary Product Accessibility Templates which explicitly state compliance with the US regulation "Section 508".Vulnerability
In 2007, 2010, and 2011, developers released a series of tools called JailbreakMe that used security vulnerabilities in Mobile Safari rendering in order to jailbreak the device (which allows users to install any compatible software on the device instead of only App Store apps). These exploits were each soon fixed by iOS updates from Apple. Theoretically these flaws could have also been used for malicious purposes.
In July 2011, Apple released iOS 4.3.5 (4.2.10 for CDMA iPhone) to fix a security vulnerability with certificate validation.
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