How do delete every Thing on my iPhone except a app?

I have a iPhone 3GS and about to sell it but I still have flappy bird and I don't want to delete it.
So how can I do this.

Go through and delete every app that can be deleted (except for flappy bird) then delete all of the history from everything like safari. Also take off all of your music (make sure it's been

You MAYBE not sure if this will 100% work download BUMP. Its very easy to do maybe if you have another device like an ipad you "Bump" it then some apps or pictures will be on your device then after you sell it you can bump it back on your new iphone.

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