Hmm....if you want the phone to listen to music but you mom doesn't want you to have anything that could get cell service, then maybe you could compromise with an iPod or some other type of MP3 player? No MP3 player can get cell service and you can use it to listen to music. If that doens't work, then there are places that still sell Discman if you can find them. I still have my old one from high school. XD
Unfortunately, compromising works better as you get older. I didn't get a basic flip phone cell phone until I was 18. Then I got my android smart phone through my own phone plan. However, I was able to have my own radio in my room since I was 6. It seems like a cell phone is a lost battle, so you may want to shift your focus on a MP3 or CD player to use for music.
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