I am a viber user from last 3 years and it was working really well when I was using an android phone. I used viber for calling feature mostly. it has a very stylish design and stickers.
but when I switched to an iphone this app started crashing and the voice signals became poor even when i’m on wiffi or 3g.
I mailed viber team too to fix the issue for iphone but didnt get any response.
so I suggest to use other apps instead which is compatible for all kind of phones.