Originally Posted by DfLo1913 View Post

Ok I see but all other apps with the same concept do the same thing

And that is the exactly reason I refuse to use either of them (viber, wazzup,...)

There is this concept I don't like: Viber grabs your contact details, sends it to some shady server in Israel where it is compared against other contact lists?
Most hideous example is the Viber port on Symbian.
They get the contacts for free. The user gets nothing but an IM client, no voice communication like on iPhone whatsoever.
Ok, if you are too lazy to put contacts in your list, the system will do that for you. But at what price - give up all your friends contact info for your own convenience?
Nice to have all possibilities open on N900, but frankly, why support them?