My first mobile data plan (which was over a decade ago) had a monthly allotment of 1GB. One big file could wipe out a quarter of my mobile data usage for the mo

My first mobile data plan (which was over a decade ago) had a monthly allotment of 1GB. One big file could wipe out a quarter of my mobile data usage for the month. So it's polite not to download large files over mobile data without asking.