[Q] Video call possibility in android

Hi guys.

I am searching for many days about this, but still no proper information.
(Old sony ercisson and nokia mobile had video calling feature.)

Why there is no default video call app in android?
(Ref: http://en.wikipedia.org/wiki/List_of...res_in_Android )
Why there is no App in market or any module for Xposed framework to enable video calls in droids.
Where some manufacturers have video called function enabled and Korean mobiles (LG, Samsung) has video call function but that doesn’t seem to work in Europe, Asia or America, it works only in korea.
Now I have few queries.
1--> is it possible to make video call from any android via any kind of customization with rooting, installing apps or with xposed framework etc.
2 -- regardless of unable to make video call, can droids receive video calls?
3-- is it possible to make video calls with Korean android mobiles, outside Korea? Or we can say, is it possible to fix this error, “when global roaming, video call not supported”. Or it is possible to enable video call when roaming.
Fronts cams are 50% useless without native video calls in androids, why nobody is trying to add video call feature in android?