Whatsapp v same hi hai contacts wicho apne aap sync kar lendaViber da eh faida ke koi contact manually ni add karna penda, aap hi contacts vich viber users identify ho jande.
viber call only takes about 240 kb per minutes so works even on 2G GPRS / EDGE
but there is no video calling and it eats up battery.
menu 2 year ho gae ne use karde nu aaj tak ne paise mange eena ne