In regards to the phone - a phone is a privilege, not a right. It also costs money to get a phone, i.e., purchasing the phone, adding the line to the existing account, adding features, such as texting, data, etc. Etc. What are you willing to give up in order to get the phone? What is the family's rule about having a cell phone? If you don't know these answers, ASK you mom in a polite manner.
As far as listening to music during the week - that statement seems a little vague. Listening to music while you are studying? Listening to music so loud you can't hear your parents? What kind of music are you listening to? More details would be helpful.
