ThinkGeek TK-421 iPhone Case With Keyboard

 ThinkGeek TK-421 has a relatively small size like the size of the iPhone itself. This product is compatible for iPhone 4 and iPhone 3GS.While unused, keyboard position can be hidden under the iPhone, simply by shifting to the left. And, when we need to use it again simply rotate to the right. 

Still, these devices has drawbacks. The addition of these accessory will increase iPhone weight. Including thicker dimensions.