[Kanji_The_Wanderer]

The Last Order (mini-movie) and Crisis Core (The PSP game) cover the same story plot.

As others have said, Last Order and Crisis Core are in the actual Playstation Final Fantasy VII game as a little cutscene.

So everything that is revealed about Zack and the Shinra is already covered in the original FF7 game. The Last Order Movie and Crisis Core game are about Zack and Cloud's relationship. The scenario is just gone over with more detail.

The Last Order mini-movie. (About 45 minutes?) Was released along with the Advent Children DVD. You could obtain it by buying the Special Edition of the Advent Children movie, so it's been around for awhile now.

The cellphone game, Before Crisis, is about the Turks, and their origins.

I was never aware of a Dirge of Cerberus cell phone game.