Maintaining a consistently up-to-date address book on your mobile phone is quite hard. Not all of your contacts notify others (including you) when their contact details change. Over time you might find that some of your contacts information is outdated and you have to update it manually. If you want to automate this process, check out Addappt. It is an app for iOS that maintains and updates your contacts' information without you doing anything.

The way it works is quite simple. You install the app and give it access to your address book. Then you get your friends (whose contact details you want to keep updated) to also install the app and add you. Once everyone you need installs and connects with you through the app, it takes care of the rest. Whenever you or your friends update their contact information (phone, address, birthday, etc) this information will be updated automatically across all interconnected address books. It is that simple. You don't need to register or even log in with your Facebook account.

As for privacy, the app doesn't store your or your contacts information on their servers, so you don't have to worry about the company's servers being hacked or some other similar scenario. The app is free and available for download from the  iTunes store.

update address book contacts
addappt

Features:

  • Automatically updates your address book contacts information.
  • Requires all interconnected contacts to install the app.
  • No need to register or sign in with Facebook.
  • No more manual updating.
  • Get birthdays added to your iPhone's calendar.
  • Great app for travelers and busy people.
  • Free to use.
  • Requires iOS 4.3 or later.
  • Related tools - Ringya, Cloudtact.

Check out Addappt @ https://itunes.apple.com/us/app/addappt/id526181666?mt=8