How to get rid of # on iphone 4s?

How do i get rid of my phone # on my old iphone 4s sprint service.trying to sell it on ebay and don't want a # on it want to sell it like new.alredy restored it to factory but still have my phone # on it.

Added (1). How will they get a new # then cause i don't want them having that one because i havea lot of people with that #

Added (2). How will they get a new # then cause i don't want them having that one because i havea lot of people with that #

I don't think you can do that. I think it will always be there no matter what.

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Factory reset won't deactivate the phone (remove the number). The only way to do that on Sprint (or Verizon) is to call Sprint and tell them you want the phone deactivated. Another way to do it would be just activate a different phone on that number, that would automatically deactivate the old phone.

If your account is delinquent (you owe them but haven't paid them), then maybe they won't let you do this.

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