What does recovery mode delete?

I have an iPhone 4, and randomly my phone said to connect it to iTunes. I did and now it's saying it's detected recovery mode. I get my music through my computer so I'm kind of sure that it backs it up there. But will it delete all my messages and contacts?

Nothing.

It deletes all data.contacts pics all your data you added.recovery mode puts phone like it is new out of the box. Hopefully you have a back up and will lose everything.

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