How to convince your parents to get you a phone?

you should tell them 10 good reasons why you should get a phone and tell them that if you don't have the phone during emergencies and if none has a phone how they are going to get help really when you are stranded somewhere you do not know of and that could happen just like on I go to Japan that Icarly movie. And if they still say no just go to your room an think of an idea that will get you closer to getting a phone like making a deal with your parents like if your birthday is coming soon make up a deal with your parents that on the morning of your birthday you can go out pick your phone and buy it. you should tell them ull find a way to pay them bil every monthe even if u hav to make loan