*To Jena,
This is about your question on Yahoo Answers whre you ask about cell phones. Your question wasn't very clear. I'm not sure if you're asking how to use one or if your asking for a good argument why your dad should buy you one.
A good way to start with a cell phone is with the pay as you go phones. I have a TracFone, myself. They start in a price range of like under $10 so the expense would be low if your dad's afraid that you'll be careless and lose it. You BUY airtime and minutes. So, your dad could keep tabs on your spending on calls by only buying you a certain amount of minutes. You aren't allowed to let your minutes completely run out or go passed the date that your bought air time expires though so you do have to keep a watch on that. That information shows right on the face of your phone so it's easy to watch.
For more information, you can go to:
http://www.tracfone.com
Oh! They sell those phones and airtime/minutes cards everywhere from Radio Shack to Walgreens and other drug stores and at Walmart, etc. RAdio Shack is a good place to buy it though because they set it up for you for the registration and everything. You have nothing else to do but use it after that. They know what they're doing and do it all right.
I cannot sign my name as you've asked people to do because I am listed as annonymous so giving my name now would defeat that purpose. Good luck Jena.