How to hide a particular contact's details?

In a nutshell,
I want to hide contact details of few persons from my Q5, like either phone number or email, or both.

How to do that?

I want the name to be visible while incoming/outgoing calls, but I do not want to disclose the numbers. I mean, when I search in my contacts, only the name should be visible. Let's say "Helen Hunt". But when someone (or even me) clicks on that name, no number should be visible, but one should be able call Helen Hunt.

There is no default option for that currently (there might be if I couldn't find it). Is there any app that can perform this action?

Thanks a lot in advance,
keypaduser.

I don't think that's possible