This one's not really a "tip" per se – it certainly won't make you more productive – but it's a fun easter egg hidden inside Ice Cream Sandwich and Jelly Bean. If you've got a phone running Android 4.0 or higher, head into Settings and click "About phone" at the bottom of the list. On the next page, start tapping the "Android version" button (you have to do five or six very quick taps). In Ice Cream Sandwich you'll see the familiar Android robot wearing an ice cream sandwich getup. Press and hold, and it'll explode, releasing tiny flying clones across your screen. In Jelly Bean you'll see, well, a Jelly Bean. Press and hold and you'll get a screen of floating jelly beans which can be dragged around. Useful? Nah. Endearing? Absolutely!