Can I call someone out of state for free? I have sprint?

My girl friend moved to Las Vegas for a soccer program for college to get a scholarship.( we're both in high school) and I live in Cali. I have sprint, if I call her will I get charged more. I can't ask my mom if its free or not cuz my mom never really liked her and thought I stopped talking to her. I have a iPhone 4S which I just bought last Saturday. Will I get charged? I think she has at&t. She has an iPhone as well

Sorry, but although you mention your service provider you don't tell us anything about your plan. Usually, you don't get charged for long distance cell phone calls. However, don't just take my word for it. If you don't know then you might want to ask your mom about it. Don't you think she will notice if your phone has excessive charges or that you are calling the same out of state number over and over?

Ask your cellular provider