How to change the Oringnal sprint number to my new number after unlocking?

I bought a sprint iphone 5 on craigslist and i restored it but i had to use my sister sim card to bypass the activation so i can unlock it to NET10. After unlocking it everthing worked good. On the iphone setting it has my sis number on it since i used it to bypass the activation. I can use imessage because it has her number on it and i can't change it. DOes someone know how to change it or fix it? OR what wrong?

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