1. Output the IS Contact to Excel file
2. Edit it e.g delete duplicate or add new contacts of mobile phone and name. Remember to add the Row Tile in the excel as heading
3. import this Edited IS Contact via Drop box and open by the IS Contacts to overwrite and delete the old contacts.
4. Make sure that to refresh the Favorites Contacts that made the Chats members coming out. May be this is very important procedure.
5. Please note when the Contacts replace by a new all contacts, in the Whatsapp information status cannot show up the details as not yet synconize the details. We can see the "Refresh Favorites" with running status.
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