How do you full screen sda videos?

I've been putting videos on my tmobile sda, but they won't fullscreen. I've tried different types of videos but they won't full screen. That just stay small. So uhh is there something I'm doing wrong? Am I not converting it right? What can I do? I want to put videos and stuff but I want them to at least fit the whole screen and not a quarter of it.

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Full screening is iffy. I'd take your phone into a T-Mobile store or authorized dealer.