iPhone 15 Pro Max--2 months old, brand new conditioon

I got a new iPhone from Xfinity on December 28th of this past year. Have used the phone for about 60 days and am going on a different plan. The phone is Xfinity locked. So you would have to have Xfinity service to use it. BUT Xfinity has awesome rates and plans. It's a good way to go. Price is $500. A...