My family didn't even know we were on a data package / thought we had unlimited internet until some time last year when we got a warning towards the end of the month that we were about to reach our limit...Either way we've mostly just made sure to just keep an eye on our internet usage % and it hasn't been much an issue..the 1.25tb is a lot of data (but we still managed to go over for the first time ever last month and had to pay extra for 1.75tb this next billing period(
Maybe look up some lower bandwidth options / video streaming / internet usage options that don't eat up a lot of data just incase you get stuck in a position where you have like a week - 10 days left before your next bill is due and your data plan has been mostly eaten up..It stinks to resort to that but I've done it a few times