So your an iPhone 4 owner and you want Siri but don’t want to upgrade (even though it is worth it), well unfortunately Apple will not be porting Siri to your iOS device. Why not? Well a couple reasons.
First a report from Michael Steeber stating that an Apple rep clearly stating that they have no plans to support older devices. A user was inquiring if there was a special build of iOS 5.0.1 in which older iOS devices could purchase Siri for a small fee, Apple responded with:
Engineering has provided the following feedback regarding this issue:
Siri only works on iPhone 4S and we currently have no plans to support older devices.
If that wasn’t enough, iFixit has reexamined a piece of hardware that is specific to the iPhone 4S: an infared LED that activates Siri. They’ve concluded this is exclusively used by Siri to recognize when your face is near the iPhone.
Siri is ready and waiting to answer her master’s beck and call at any time. And in order to be as attentive as a personal assistant ought to be, Apple had to design the proximity sensor to be as vigilant as Big Brother, but as cute as Little Sister. So whenever the screen is active, the proximity sensor is active too. Thus, whenever you raise the iPhone 4S to your face, Siri is ready to take orders.
This new sensor doesn’t seem to be on any of the older iOS devices so unfortunately it looks as if upgrading is your only choice (or waiting for a hack).
Of course Apple can change their mind at any time but we’re sure they’d like to keep this to the iPhone 4S as it is a big selling point.











