You can use a Bluetooth keyboard for better typing experience on your iPhone 4. But if you wish your items are easier to carry, the following Spike iPhone 4 case with real keyboard may be more suitable for you.
The Spike is an innovative, form-fitting protective case designed for iPhone 4 and iPhone 4S, and available in two types including Spike¹ and Spike². As we can see from the images, both the iPhone 4 cases feature an integrated, mini keyboard that doesn’t require plugging in, Bluetooth, or any external power source, which offers you a more comfortable typing experience than virtual keyboard. Spike¹ iPhone 4S case needs you to rotate the bottom section of the case for typing, while the Spike² comes with a specially designed 360 degree hinge that allows you to quickly toggle the keyboard on and off the screen for typing and full-screen access. Of course, the hardshell construction also protects the iPhone 4 or 4S from bumps and scratches, and all buttons and functions are accessible via custom cutouts.
At present, the designers of the Spike are raising fund on Kickstarter. Pledge $25 will let you own a Spike iPhone 4 case with real keyboard. If you’re interested, jump to Kickstarter official site for more details.