This, boys and girls, is a propaganda piece. Pure fiction.
Besides the fact that no one calling their own mother direct would use his first AND last names: "Mom, this is Mark Bingham...you believe me, right??" Cell phones would not have worked from that altitude in 2001.
Also, it's been admitted that United Airlines #93 was shot down.
If you really want to know what happened on 9/11, buy the Alex Jones DVD "Terrorstorm."