Can I get the iPhone with my plan?

Ok Hi you guys I really want the iPhone 4s but I have the HTC EVO and I've had this phone since the seventieth grade ( now going to highschool ). And I just want something different since I've had this phone for so long. So my question is can I get the iPhone if my plan is with sprint? Also how much would it cost because I know it won't be free.

Well it will probably cost not so much since you had the phone for awhile bc usually you'd be able to have it for a year and then upgrade to a new phone for free. So if I was you I'd go to Sprint and ask them.