Is the iPhone 5s only $100 currently on Sprint or is there more monthly fees?

I want to become a new Sprint customer but I want the iPhone 5s, right now it is on sale for $100 but I'm not sure if that is just the first fee for the phone only besides the monthly plan, is there going to be more fees each month to pay off the phone that is originally $650 so it says while discounting. I'm planning to get the $50 unlimited my way plan with the 1gb data which is $20 more for a total of $70 without taxes. I just want to know if the phone itself will only be $100 and there's no extra payment every month to pay off the $650 or something. I was also thinking about getting it straight from apple for $200 and just selecting my plan, but I'm also unaware if that is just the first monthly pay or if that is the total without taxes. I really need help. Please and thank you.

The phone will be 100 dollars (depending on your credit once they are processing you) they will tell you if you may need to pay a bit more just in case. There will be no monthly fees for the phone. You will be on a contract with sprint for 2 years. This means that if you terminate before the two years you are liable to pay from 325-375 dollars. But yes all you pay is 100 dollars for your phone and our monthly service and data plan.