How can i make video call on samsung i900 omnia mobile?

Recently i have purchased new imported samsung i900 omnia mobile.I am using 3G dolphin(mtnl)sim but i am not able to make video call.Pleeeeeeeez help.How can i make video call on samsung i900 omnia mobile?don't know about this but you know you can make over your samsung i900 by cover it with samsung instinct skin. you will get graceful skins from http://www.decalskin.com/ site!