There is nothing more annoying than duplicate and incomplete contact information on your phone, especially now that people are relying on Siri to access their contacts for various reasons. Smart Merge is an iPhone application that promises to clean up your messy Contacts app.
The app will hunt down duplicates in your Contacts app so you can merge them into one. Smart Merge also allows you to backup your contacts, sync your contacts between multiple devices, and locate incomplete contacts without a names or phone number. The name of the app also suggests you can merge your Facebook and Linkedin accounts.
Smart Merge is available for $0.99 though the App Store. It's compatible with both the iPhone and iPad, and requires iOS 5.0 or later.