One of the glaring features that Apple left out of Siri is the ability to integrate with and launch apps. You can do all sorts of things with your voice and Siri, but you can't use third-party apps (short of a few exceptions and the services Apple officially partnered with for launch) or open apps with a voice command.
Thanks to the widely undocumented world of iOS URL schemes, you can actually trigger app shortcuts with Siri on your iPhone 4S. While it's not the cleanest method, there are tons of possibilities for quickly launching apps with Siri. Let's take a closer look...