Here's what I have so far - guess it's only 16, it felt like 25 when I wrote them

But in my defense, some of the items actually contain 2 or 3 rules on the same topic. I am sure I will add a few more before Christmas morning too. I will say my daughter has some struggles with following rules she doesn't like, so these may read a bit harsh to you but clear, absolute rules are a necessity in our house:
1. You must always turn your phone off during class and study hall. The phone must be left in your locker, your purse or your backpack during class and study hall.
2. You may not call anyone except me during school hours.
3. No cell phone during homework. You must leave the phone in the living room during homework.
4. No cell phone after bedtime. You must leave the phone in the living room at night.
5. No calling/texting during meals.
6. I have online access to your account and will be reviewing all of the numbers you call or send text messages to. You must tell me who a number belongs to if I ask you.
7. You must give me the phone any time I ask. I may review any call logs, photos and text messages that are on the phone. Be aware that there are ways I can see call logs, photos and text messages that you delete.
8. Never take an inappropriate picture with the phone, either of you or anyone else. NEVER.
9. Never send inappropriate text messages or photos to anyone, or say anything inappropriate during a phone call.
10. If anyone sends you inappropriate text messages or photos, or says inappropriate things to you during a phone call, you must tell me about it immediately.
11. If anyone you dont know calls or text messages you, you must tell me about it. NEVER give out any personal information (your name, your address, your age, etc.) to anyone you dont know.
12. You must make the money loaded onto your account last until next Christmas. If you do not, YOU will be responsible for adding more money onto your account. You are responsible for telling your friends to stop texting and calling you so much if they do it too often and it costs you a lot of money. Do not access the Internet from your phone, it costs a lot.
13. You are responsible for taking care of your phone. It is your responsibility to replace it if it gets stolen, is broken or is lost.
14. If you lend your phone to a friend, you are responsible for anything they do with it.
15. Use your common sense if you dont want me to find out about it, then you shouldnt be doing it.
16. I may add new rules at any time I want. You are not allowed to argue with me about it.
IF YOU BREAK
ANY OF THESE RULES, YOU WILL LOSE YOUR PHONE IMMEDIATELY. THERE WILL BE NO WARNINGS OR SECOND CHANCES.