Worked great!

Somehow after over 9 years of iPhone usage and five or six PCs and macs on my account I ended up with 2 or 3 copies of many contacts and even more of others. This app cleaned them all right up. Removed over 1000 duplicates or partial duplicates from my contact list. You need to play with the filters a bit to get it to remove them all but start at the presets and remove the exact dupes first and go from there. App worked exactly as advertised.

Braykart5 about Cleanup Duplicate Contacts!, v5.0.3