When you connect several accounts (Gmail, Microsoft and Local Address Book), you may end up with duplicate contacts. For example, one contact from Gmail and another from Microsoft. UpHabit will discover contacts that can be merged. 

A message at the top of the Relationships or Discover tab will indicate if duplicates exists.
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UpHabit will present you with a list of contacts that can be merged.
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Tap on the contact card to start the merge process. You have the following options:

X - No changes will be made
Merge - Merges contacts
​Never Merge - Contact will not be merged and no longer be discovered
​Delete - Delete Contact
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Once you confirm the merge, you will be taken to the contact edit screen where you can add/remove additional details.