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You need an app like hangouts,viber etc to make a video call.
The other user has to use the same app like you.
Unfortunately most of the new phones using modern mobile OSes doesn't support 3G Video Call. It's true for Android, iOS and WP.
I remember times when I was using it on my old Symbian phones and even feature phones but since iOS and Android took over mobile world no one remember that feature anymore.