Learning how to type fast on an iPhone is not that hard. But I have always been faster using a physical keyboard. If you happen to be in the same boat, you may want to give the Typo Keyboard Case a look. This is a cool case that allows you to type faster with less typos. You get backlit keys, auto correction, and a battery indicator.
The case is compatible with iPhone 5 and iPhone 5s. It has a 180 mAh battery inside. You can install the keyboard easily and start typing right away. The Typo Keyboard Case could prove useful for folks who are switching from phones that have a physical keyboard. It will ship in January 2014.