How can I group duplicate contacts from different sources (Google, WhatsApp, etc)? I have installed an ICS ROM (Virtuous Inquisition 4.0) on my phone. In my address book I am syncronizing all contacts from my Gmail, Google+ and WhatsApp accounts with the consequence that some contacts have THREE entries! Is the ICS address book not able to group them together by default? I know this question is similar: How do I remove duplicate contacts from Google+?, but the proposed solutions don't seem to work or are not really adequate.
Please try the following:


Select the duplicate contact Edit the contact 
Access the menu for the edit contact page, and select the Join action
Select the contact you want to merge with from the suggested list, or search for
the appropriate one.


Doing this will link the contacts.