By default, you can’t turn the iPhone Springboard in landscape mode. The iPhone is meant to be held in portrait mode, at least when you’re navigating between pages on your Springboard. That’s what Apple wants. But some users have been asking – Why can’t we put the Springboard in landscape mode if some apps, like Mail, support the horizontal orientation?
Cydia developers, as usual, are here to come up with alternative solutions to Apple’s restrictions. My guess is that Apple doesn’t want you to turn your Springboard horizontally because that would require an icon layout adjustment, just like on the iPad. Besides, the iPhone has a much smaller screen and layout adjustment would turn out to be a huge problem to deal with. Read more