How do I look up my balance due to pay off my phone?


I have looked everywhere. I want to pay off my phone so I can switch to an Android instead of iPhone. But I can't find my balance due ANYWHERE. My situation is complicated because I'm on my Grandparents plan and I have little to no access to their account, besides paying my part of the bill. I tried calling customer service but they ask for a PIN that I do not know. Help?

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