Viber is an application that is used for calls, to send messages, photos and also video calls and messages to other users. As like calling within country, it also uses for making calls abroad.
To use Viber when in abroad, you just need to have 3G, 4G or Wi-Fi connection. But you have to know that mobile data charges could be applied if your data package is over.
If you don't have data package then you can simply use Wi-Fi connection. But Internet resource is necessary to use it.
Viber is easy to use when abroad. You just need to have internet resource and then you can use any feature of Viber like messaging or calling.
