• Note: For an updated roundup of jailbreak apps in the iPhone 3.0 OS era, see "21 apps Apple doesn't want on your 3.0 iPhone"
Apple's SDK and iTunes App Store rules have prohibited apps that exploit certain iPhone features, such as global UI enhancements (e.g., copy and paste), video recording and streaming, multimedia SMS, Bluetooth file sharing, Internet tethering, and background processing. Apple also blocks apps that don't fit its vision for iPhone usability, including podcasting, direct GPS access, and competing e-mail and Web browser clients. The following 21 apps today run only on jailbroken iPhones. Some of their capabilities will ship with Apple's 3.0 iPhone firmware, but most of them won't.
• Get past the chaos of the Apple App Store. Use InfoWorld's iPhone app finder to discover great apps for business and IT.
This slideshow, "21 apps Apple doesn't want on your iPhone," was originally published at InfoWorld.com. Follow the latest developments in Apple and the iPhone at InfoWorld.com. For the latest business technology news, follow InfoWorld.com on Twitter.