I canceled at 121 days.
although it didnt show up as completed, I counted 122 days, so I cancelled on the last day b4 the new bill...
here's my results from this "game":
spent on phone (pixel3) 869.91
service charges (see attached) 31.96
total out of pocket - $901.87
sold phone on ebay for 500 (-minus ebay/pp fees) = 435
sold gift card on DDF = 696
total profit - $229.13 plus 4 months of service!
Thanks google!