AssistantConnect lets you give Siri to friends with devices that don't support the popular assistant.
The new tweak created by Bilal S. Sayed Ahmad is now available in Cydia and lets users with an iPhone 4S send their Siri authorization data to friends for use with Spire.
Unfortunately, the authorization data expires after about 24 hours so you will need to share your info daily which is not practical long term.
To use this tweak you will need to install AssistantConnect4S on your iPhone 4S. Open the app then activate Siri and perform a test query. Return to AssistantConnect4S, press the Email Siri Data button, and email the data to a friend.
On the device that doesn't support Siri, you should install AssistantConnect from the Big Boss Cydia repository. Open the email that was just sent from the iPhone 4S and tap on the attachment. This will open AssistantConnect and enable Siri to work until the expiration date noted.