Needed to understand my bill for upgrade to an iPhone 12.
Monthly Fees for Mobile Service = $50
Monthly Fees for Payment Program = $34.84
Mobile Plan - 15 mos. $10
Payment Program - 24 mos. $20.84
Will my monthly bill be $54 for the next 15?
Welcome to the community!
Base on the information you provided I can safely say you should be paying $50 for the next 15 months then it goes to $60 after that.
If you are still unsure and have more questions regarding the billing you can always contact customer service directly and they can review your account and better assist you.