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You can chat one-on-one, or add more participants (up to 10), using your phone's front or rear camera.Video calls, and even most voice calls, are free to any other Hangouts user.What's great: Of all the apps on this list, Imo is the easiest to use for video chatting.
(There are a few countries in the Middle East that won't allow Face Time calls).
For video calling, you can either send a pre-recorded video in a chat, or have a live video conversation.
There's no dedicated video calling option, instead you start a new call with one of your contacts and then select the video option.
Like Hangouts and Viber, you can use Imo to send text messages and stickers, but the app makes it dead simple to place a video call, giving you the option in the main contact list view.
With one tap, you can launch a video call, without even needing to open a conversation, like you need to do with the other apps.