The Cleanup Duplicate Contacts app can find and suggest updates to your contacts.

In the case of the phone number, the updates might include changes in the area code, city, or country. In addition, it is also possible that the number has changed.

In the case of email addresses, the updates might include changes in the email address itself, in the domain name, or in the signature.

The app is based on a simple algorithm that makes it possible to find and suggest updates to your contacts.

This is done by analyzing the information in your address book and by comparing it with the information in the address book of the contacts.

In addition, it is also possible to analyze multiple sources such as Gmail and iCloud.