1) No. u need internet
2) You need interent to get free call through viber. however viber will direct u to a normal charged call. basically u will be using your normal celcom/maxis/digi/etc call.
3) Yes. when u insert a new number, viber automatically scans that number and if that number is a viber user it will automatically insert it into the viber contacts. oops, to answer your question, just send them a message, if the message status is delivered then he is online and the message is delivered.

in summary, to have the best of viber, the caller and calle need to be on internet, either wifi or 3g.

This post has been edited by ramz: Jun 26 2012, 01:12 PM

if u use "Call Viber (free call)" and he is not online, then call won't get through. that's all.
if u use "Call Mobile" then viber just redirects u to a normal call where normal charges apply. the callee will get a call through the phone line, and not thru viber.

---

Added on June 26, 2012, 1:21 pmviber to viber call is free! even if the callee is in the north pole.
yes its free, but you must be online and he must be online. if either of u are not online. then although u can make a call thru viber app, it is actually a normal call where charges apply. normal call means call thru you phone line (e.g. celcom/maxis/digi etc......)

This post has been edited by ramz: Jun 26 2012, 01:21 PM

why does viber take more memory than whatsapp? whatapps is about 5.9 MB, but viber is 17MB. its nearly 3 times as more. its killing my samsung galaxy s.

how does viber make their money i wonder?

---

Added on July 31, 2012, 2:11 pmi rely heavily on skype for video. skype has lousy competitors in the video chat space. ooVoo, Tango are like yuck so far.

This post has been edited by ramz: Jul 31 2012, 02:11 PM

both quite stable.

skype, like viber, if u call using internet its free. but u have to pay if u call your traditional phone line (mobile or fixed). but its quite cheap and u save a lot if overseas call.

skype and viber compete on voice call. but skype takes way too much battery and memory compared to viber. skype is not meant to be "always on" unlike viber.

they are selling your info. or they are a charitable organization.

So you are really a charitable organization.