iOS Jailbreak developers Grant Paul (aka @chpwn) and Aman Gupta have found a way to add custom commands in Siri voice system. The developers confirmed it via their twitter account and posted an image as a proof showing Siri voice assistant responding to quirky custom commands.
The hackers achieved the feat without using the Siri API. They have instead used iptables to forward Siri traffic to a local EM proxy that alters responses from Apple servers.
Don’t expect them to release the Siri Custom Commands hack in public before iPhone 4S is jailbreak is announced; by either iPhone dev team or Chronic Dev Team. Since, Musclenerd has already demoed half-cooked preliminary iPhone 4S jailbreak, expect them to release the updated redsn0w jailbreak in few weeks from now. No ETA, however.
But how custom Siri commands can be useful? If you think the Siri is not programmed well to your commands, you will be able to add them. In simple terms, it will answer whatever you want her to.
The latest hackery could also potentially open the doors for some incredible applications and jailbreak tweaks to come.