Installing third-party installers such as Rock, Icy, etc. might cause Xpandr and other extensions to not work properly. Please use Cydia to continue.
Xpandr works on every iPhone, iPod touch and iPad model.
You need firmware 3.0 or higher to be able to use it.
If you want to use Xpandr in Mail.app, you need to have firmware 3.1 or higher installed on your device.