Contact is definitely an essential part of our daily use of mobile phone.However, you’ve probably experienced the nightware of duplicate contacts which totally messed up your contacts list, especially if the duplicates have different information the more of a headache it can be. Now please follow thi article to get rid of the duplicate contacts.
Part 1: How to Delete/Merge Duplicate iPhone Contacts via Syncios
Now and then, you may need to delete a number of contacts on your iPhone. If you would like to turn your iPhone to someone else, you may need to delete all contacts on iPhone at once. Deleting multiple iPhone contacts or removing all iPhone contacts at the same time on the iPhone itself is a laborious task since Apple's software only lets you delete one contact at a time, which can be a tedious process if you have 100 names that are destined for oblivion. The good news is, this Syncios contacts editor enables you to delete contacts or de-deplicate contacts easily.
Syncios Mobile Manager
Syncios Mobile Manager is an easy-to-use and powerful iOS&Android Mobile manager, which is well-designed for users who want to manage device contents on PC. It allows you to export contacts, apps, photos, music, ringtone, videos, SMS messages, eBooks and more.
Support to transfer, edit, backup, manage, view mobile data. Download videos from 100+ video sharing sites. Handy tools: Audio converter, video converter, ringtone maker, etc. Fully compatible with latest iOS 13/iPhone XS Download
Win Version Download
Mac Version

Step 1 : Download and Install Free iPhone Manager on Computer
Step 2 : Connect your iPhone/iPad device to computer and launch Syncios iPhone Manager. If this is the first you use Syncios program, then it will take a while for Syncios to download iOS related services for you. And keep your device unlocked, click "Trust this computer" on your device screen.
Syncios can not recognize your iPhone device? Please follow this tutorial.

Step 3 : Click "Information" button, you will see 7 options available for choose: Contacts, Notes, Bookmarks, Call history, Messages, WhatsApp and Bookmark History. Go to "Contacts".
Step 4 : Choose the duplicate contacts which you want to delete, and click "Delete" button. Then the duplicate contacts will be removed from your device.

Step 5: To merge the duplicated contacts on your iPhone X device. You need to choose all your contacts, and simply click "De-duplicate" button.
Step 6 : All the duplicated contacts will be displayed in Syncios, you can match the contact by name, phone number or exact information. Choose the contacts you want to merge and click "Merge" on the right. And your iPhone X contacts will be easilly de-duplicated.


Part 2: How to Remove Duplicate iPhone Contacts via iCloud
You can also remove the duplicate contacts via iCloud. It's not the most efficient way to remove duplicates but it's one of the most assured ways of making sure you clear out everything.
1. Set-up iCloud Contact Sync on iPhone
Step 1 : Go to Settings.
Step 2 : Tap on iCloud.
Step 3 : Make sure the switch for Contacts is ON.
Step 4 : Now, your iPhone contacts should start syncing to iCloud.

2. Check Your iPhone/iPad Contacts on iCloud
Step 1 : Log into your Apple ID account at https://www.icloud.com.
Step 2 : Click on Contacts and check to see if all the contacts are synced.
Step 3 : Scroll down to note the number of contacts.
Step 4 : Cross-check with your iPhone contacts (scroll-down in Contacts app)

3. Turn off iCloud Contact Sync Option on iPhone
Step 1 : Go to Settings > iCloud.
Step 2 : Turn OFF the Contacts switch.
Step 3 : Tap on ‘Keep on My iPhone/iPad' (or if you want to wipe out everything, a clean slate, tap Delete).

4. Login to iCloud and Remove Duplicates Manually
Step 1 : Log into your Apple ID account at https://www.icloud.com again.
Step 2 : Click on Contacts.
Step 3 : Now start the cleaning process. You can hold on CTRL/SHIFT button to choose batch contacts. Remove/merge duplicate entries.
TIPS: In the web interface of iCloud Contacts, you can click on the little cog icon on the bottom-left to get the Delete option.

5. Turn on iCloud Contact Sync Option on iPhone
Now, you can turn on iCloud sync on your iPhone. Effectively, all contacts from iCloud will be synced to iPhone and the duplicates should be gone by now.

Part 3: How to Remove Duplicate Outlook Contacts
Sometimes you have duplicates in your Contacts folder. Duplicates can get created when you import a bunch of new contacts into Outlook, and you have existing contacts with the same name or email address.
1. For Outlook 2013/2016
Step 1 : Click People.
Step 2 : On the Home tab, in the Current View group, click the bottom right corner of the views box, and then click Phone. This is the best view to scan your contacts list and see the duplicates.
Step 3 : In your list of contacts, hold down Ctrl and click each contact you want to delete.
Step 4 : When you've selected all the duplicates, press Delete or Ctrl+D.
2. For Outlook 2010
Step 1 : In Contacts, select the contacts folder that has duplicate contacts.
Step 2 : On the View tab, in the Current View group, click Change View, and then click Phone. This is the best view to scan your contacts list and see the duplicate contacts. Now you can sort the list by modified date and group the duplicates together. It might be easier to sort the list by modified date and group the duplicates together:
On the View tab, in the Current View group, click View Settings. Click Columns, and then in the Select available columns from list, click Frequently used fields. In the Available fields list, click Modified, and then click Add. Click Move Up until Modified is at the top of the Show these fields in this order list. Click OK twice.Step 3 : In the list of contacts, hold down CTRL while you select each duplicate contact.
Step 4 : When you have selected all the duplicate contacts, press DELETE.
NOTE: If you want to prevent the creation of duplicate contacts when you import contacts, select Do not import duplicates or Replace duplicates with items imported in the Import and Export Wizard.
Do not import duplicates Existing data is kept, and the duplicate information in the Outlook Data File (.pst) is not copied to the Contacts folder. Replace duplicates with items imported Existing data in the Contacts folder is replaced with the information in the Outlook Data File (.pst) that is being imported.3. For Outlook 2007
Step 1 : In Contacts, select the contacts folder that has duplicate contacts.
Step 2 : In the Navigation Pane, under Current View, click Phone List. This is the best view to scan your contacts list and see the duplicate contacts. Now you can sort the list by modified date and group the duplicates together.
Step 3 : On the View menu, point to Current View, and then click Customize Current View.
Step 4 : Click Fields, select Modified in the Available fields list, and then click Add.
Step 5 : Click Move Up until Modified is at the top of the Show these fields in this order list.
Step 6 : Click OK twice.
Step 7 : In the list of contacts, hold down CTRL while you select each duplicate contact.
Step 8 : When you have selected all the duplicate contacts, press DELETE.