What does it mean when an iPhone 5s without a contract?

I found a brand new iPhone 5s (sprint)on eBay
But it said that it doesn't come with a contract.
-Does it mean i can't text or call?
-And does it mean do i have to pay more money afterwards?

It means that you don't have to pay a monthly fee to a company. When you buy a phone, it usually has a contract that forces you to pay a specific company for usage for around a year. Without the contact, you ONLY get the phone, without any monthly payment to a company.