If you like to text a lot or call your friends and talk with them for hours, you should give this free application a try. Viber lets you send messages and make calls using internet to any person who has this app instaled. Read more to find out why this app is much better than skype an other similar apps.
It's advantage over other applications such as skype is that you don't have to know the username of person you want to call or send SMS, nor add this person to contacts. Viber uses your phone number. Even more, when you install this app, all contacts from your phonebook who use Viber will automatically appear in your phonebook. When a contact from your phonebook join Viber, you will get a notification that he/she is now using Viber and he/she will appear in your Viber contacts list. Viber is always running in background, so when you get a message, you get notification (as normal SMS messages) and when somebody calls you, your phone rings. So, it's working as normal phones, only difference is that it uses internet.
Another advantage is that its voice calls have a much better quality compared to ordinary calls. But I wouldn't recommend voice calls over mobile networks (3G, Edge etc.), unless you have a larger data packet, while you can send lots of text messages even with smaller data packages.
