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Shake to undelete
Deleted an important email by accident? There's no need to go digging around for it like a starving raccoon in the trash; you can just shake to undo!
For this to work you much be using the default Mail app. The shake to undo feature also works in other apps — give it a try.
On the level
Did you know that you can use the built-in Compass app as a spirit level? Just fire up the Compass and swipe the panel to the left to reveal this feature. In my experience this makes for a pretty accurate level.
Scrolling is a pain
Ever scrolled down to the bottom on a really long page, and then hate the prospect of having to scroll all the way back up? Simple, don't scroll, just double-tap!
Just double-tap on the top of the screen to take you instantly to the top. This is a huge time-saver.