When I was in Afghanistan a few years ago, I bought a Nokia 1680 Classic cell phone. When I left I wasn't even thinking about my phone. With this phone I have to buy hours, kinda like a Tracfone. Do I have to change the sim card? Can I find a service provider that I can use this phone? I mean the one that I buy hours for the phone. I'm not too smart when it comes to cell phones. Thank you in advance for any help you can give me.