What uses MB on my iphone downloading apps or playing the apps

What uses MB on my iphone downloading apps or playing the apps?!

It depends on the app itself, the actual downloading DOES use up MB, however, certain apps may have in-game purchases or downloads.
For example, if you were to play, say, Angry Birds, the only downloading you would have to do would be the initial purchase from the App Store. However, if you were to use Meme Generator, you would use up downloads to view the blank memes.
Hope this helps!

Oh, and sorry about the poor examples of apps, I was just looking at my ipod while typing this.

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