Device Info helps Siri tell you detailed information about your iDevice

  Device Info is a tweak released today in Cydia, and with its help, any iDevice owner can quickly see detailed information about their terminal. The tweak works with Siri and lists system information about terminals. More precisely, the tweak helps Siri tell you what IP/IMEI/Mac/UDID you have, helps it tell you the frequency of your processor, the total memory in the terminal, the version of iOS installed, plus much, much more.

  To force Siri to give you detailed information about your iDevice, you just have to say the command Device Info and you will be shown information similar to what you see above. Device Info is available in Cydia and only works on iOS 5.x.