Hi,

This is a member of the Viber R&D Team!

Viber itself - the app and the service - is totally free, meaning we (Viber) don't charge anything from you.

Since Viber uses the internet to function, both sides of the conversation must be connected to either WiFi or 3G. If a user is connected to WiFi - that user is not paying anything for sure. If the user is connected to 3G, the user *may* be paying his cellular company for the data (Viber uses 0.25MB per minute of call), but that depends on the specific data plan that he has with his cellular company, and needs to be verified with them.
Any phone call or text message to a user who doesn’t yet have Viber is considered a “regular” phone call/text message.  It is carried out through your carrier according to the rates of your cell phone plan.  When calling/texting such a contact via Viber, you are warned accordingly prior to making contact.

If you have any question about Viber - please feel free to ask.
Thank you,
Viber Team

Hi,
I apologize for my delayed response.

Does this problem still persist?
If so, please specify what country you're located in and which cellular network. Also, make sure to test Viber on both 3G and WiFi networks, in order to determine the source of the problem.

It sounds like there are momentarily issues with the network you are connected to. We, at Viber, are not aware of any special problem with using Viber in Malaysia.

As I recommended, please test Viber on a few different WiFi networks and see if the problem occurs on all of them. IF not, then it's probably a local issue with the network you use regularly.

does anyone else think skype is screwed ? now they got competition from viber ?

oh i see. so viber is not quite there just yet hm .... 
Hm can skype do free calls between skype phone and someone with the skype software for free ? like viber does