Duplicated contacts if stored on the SIM

What steps will reproduce the problem?
1. Open Android native contact manager application
2. Create a new contact on the SIM named "Test" having number: +39123456789
3. Create a new contact on the native address book named "Test" having a mobile 
number: +39123456789 and an office number: 0123456789
4. Open Imsdroid and look for "Test" contact in the address book list.

What is the expected output? What do you see instead?
Expected output should be to see 2 instances of the contact "Test", one from 
the SIM and one from the native AB. There are 3 instances instead, two for the 
native AB and one from the SIM.

What version of the product are you using? On what operating system?
Tested on Imsdroid v2.0.520 on Samsung GS2 running Android 4.0.4

Please provide any additional information below.
Removing the contact form the SIM will fix the issue, showing only one instance 
of the contact in the AB list.

Original issue reported on code.google.com by android....@gmail.com on 5 Dec 2012 at 3:52

kcj / imsdroid

Duplicated contacts if stored on the SIM #419