How to unlink an iPhone from another one?

I got an iPhone 5 a while ago and it linked with my old iPhone 3GS so no matter what I download or delete from a phone it deletes it on the other one. I want to wipe clean my 3GS one and get rid of it but if I do it's going to wipe clean the one I use now. How do I unlink them?

Both phones are signed into icloud. In both phones go into settings-icloud; I bet they are signed into the same account. You will have to delete the account off of one of them to stop. I recommend the older phone.

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