Would IOS 7 download itself eventually?

I have an iPhone 4 with IOS 6 on it. I can't download 7 due to not enough storage. I told my cousin this and he said "it'll just download on itself".
So if it does download on itself, would my memory be wiped away? I have 524 MB left of storage and to download IOS 7, one needs 2.9 GB.

No! It will not download by itself.

Move all your photos your PC/MAC and if you have space left download it and after updating it
you can transfer it back to your phone. Or you can delete some apps or music and make 2.9 gb after installing the update you will have lots of memory left you can download the songs or apps again!

It can't download itself. It may be able to if you sync with your iTunes, although I highly doubt it. It wouldn't get rid of any of your pictures or anything, I'm pretty dang sure.

No, I think you must delete something to leave enough space for iOS 7

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