Recently available on Cydia, we have two tweaks to handle Siri but this time is to turn it on or off. If you don’t want to use Siri and feel that it is quite irritating when pressing home button, you can opt for one of the two tweaks, Sirienable or Siri SBSettings Toggle.
As usual to you need to have a jailbroken iPhone to install any of the two. After downloading of the two packages from Cydia, you can find this Siri tap in SBSetting by simply open the More to enable Siri tap. If you use iOS 5, the SBSetting is right in Notification Center and Siri tap is right there too.
Feel free to get turn on or off Siri. Sirienable is available on MobMyi and Siri SBSettings Toggle is on BigBoss.