Step 2: After the app is installed, launch the app on your Android smartphone.
This app will start scanning all the contacts on your Android smartphone.
Only the unique details of every contact will remain in your gear.
Voila, you are done!
To access this feature, you oughta unlock the contact syncing with Gmail.
Once done, it will display all your contacts.
All you’re gonna wanna do now is tap on duplicate contacts and delete it.
Or else, it’s possible for you to simply merge it.
source: www.techworm.net