How to set a song as a ringtone on my iPhone 4?

I lied. It's not mine. But that's not the point.
My friend has an iPhone 4 and she wants to set one of her songs as the ringtone. How do you do that? Can you do it?

No you can't choose your song as a ringtone on an iPhone, apple doesn't allow that because they want to eat your money by making you buy ringtones…

To get then for free, you must download an app, search a ringtones app in the app store and follow the instructions they give you

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