If you love the iPhone, but still miss the physical keyboard that's found on Blackberry smartphones, the Typo Keyboard Case is a great solution. This is a case that fits the iPhone 5 and 5s, and was invented by radio and TV personality Ryan Seacrest.
The Typo keyboard is fully backlit and connects to the phone using Bluetooth. Despite the "Typo" name, its creators claim that users have reported 50% faster typing with better accuracy. And since the iPhone's on-screen keyboard doesn't have to be displayed, the Typo case brings back 40% more screen space. It also has custom smart auto correction, and quick access to currency keys.
The Typo Keyboard Case does have some drawbacks. It has its own separate battery, meaning it needs to be charged independently from the iPhone itself. It also covers the iPhone's home button, which means iPhone 5s users won't be able to take advantage of Apple's Touch ID fingerprint reader. If having a physical keyboard is crucial for you, however, then this is the only real solution for the iPhone.