Developer Eric Day has uploaded a jailbreak package entitled Siri0us. Day describes his tweak as “Siri dictation for your iOS 5 devices. No iPhone 4S keys/files required.”
"Dictation works great on the iPhone 4, transcribing words into text rather quickly. The technology is actually Naunce-based dictation, but the end result is pretty much the same as Apple’s Siri. As you can see in the video, small ads are displayed in the bar above the mic icon. You will need an internet connection for the microphone to show up."
To get Siri Dictation running on your jailbroken iDevice, simply add http://apt.if0rce.com to your list of Cydia sources and search for “Siri0us.”
The developer has noted a bug that some may run into when trying to install. If your iDevice keeps respringing, do not restore! Use a SSH tool to remove the /System/Library/PrivateFrameworks/AssistantServices.framework file.
