Can i update to ios 7 on a prepaid iphone?

I ordered a prepaid sprint iPhone yesterday and I'm pretty sure it will be running IOS 6 when I open it. Will I be able to update it to IOS 7 or not because it's prepaid?

Sure, but you probably won't like the update.

It doesn't matter if it is prepaid or not. As long as it is a compatible model it can update to iOS 7. Also it 98% would be iOS 7 out of the box.