How to change my Apple Account?

I have set up my apple account on my iphone with an email that no longer suits me. The phone is not on an icloud. How do i completely change my apple ID to an icloud email address while keeping all of my data on the phone.

I've never tried this but if you're worried about losing the data on your phone, I would recommend calling Apple customer service or going into one of their stores to speak with an employee. You're guaranteed to get an accurate and reliable answer this way, and if anything goes wrong, you can blame them!