I got a new IPhone 5s but I can't make calls?

My Dad got me a iPhone 5s recently, I don't know where he bought it. He said it came with 2 months with a Plan already (T-Mobile), but I can't make calls or text. I do have a number. When I try to call someone, it says "Your call was suspended"and… Bla bla bla bla bla. How do I fix this?

Contact T-Mobile and see what is up. T-Mobile is the only one who will be able to make your phone work.