[Q] 3G Video Call icon on native Dialer - Sprint Samsung Galaxy S 4 Q&A, Help & Troubleshoot

Hi
I have got an sprint L720 and got it unlocked for International use. How can I make 3G Video calls on this. Anyway to enable 3G video calling support with native dialer.
I have another i9505 which has the video call button in dialer and when I make a video call to L720 I get error that video call receiving is barred on other end.
Any help or suggestion.
Thank You

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