The best alternatives to Viber 10 are Google Play, WhatsApp, and Fam. If these 3 options don't work for you, we've listed a few more alternatives below.
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WhatsApp Messenger is a FREE messaging app available for iPhone, Android, and other smartphones. WhatsApp uses your phone's Internet connection (4G/3G/2G/EDGE or Wi-Fi, as available) to let you message and call friends and family. Switch from SMS to WhatsApp to send and receive messages, calls, photos, videos, documents, and Voice Messages.
wifiCall is a mobile application that enables you call anyone, anywhere without the need of a mobile sim card. With wifiCall, you don't have to worry about poor signal of your mobile network when you want to make a call.
Back in September, Facebook launched a new app for iOS called Bonfire that allowed users to host group video chats with 8 of their friends at once. To help spice up conversations, there are also fun video effects that could be applied similar to Snapchat’s 3D lenses. It's now available on Android too.
Make a group, just like a Whatsapp group and go live on the group. Your friends will receive a notification about the group being live and whoever is free and available can join you in talking, others can join and listen to you or comment while you talk.