Why did the space on my iphone randomly free up?

So not long ago, i had like 6.3 gb used up (i have an 8 gb, and it sucks balls, cuz i can't have *** on my phone) and now, randomly, without deleting anything, it went down to 5.7? I did nothing to it, it just randomly did this. Is theree any reason this could have happened? I just wanna know cuz i'm afraid my phone might be deleting things by itself but i didn't notice anything gone… So has this happened to anyone else?

Maybe when you synced with itunes it removed some remnants of something previously installed.

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