I have recently launched a smart phonebook called SharkID, which auto updates itself. If your friend changes their job, number, email id, address your phonebook will get auto update. Further your SharkID is your name, numbers, email id, social handles, address, biz cards, emergency cards etc. My sharkid is ~Sharko. Currently available for just Indian Market. You can download the app from playstore and create your person & professional cards. You can even know how many people have stored your number but you haven't.