also called FUP · acceptable use policy (data) · fair usage policy
A clause letting providers throttle or limit usage that far exceeds normal levels, even on unlimited plans.
A fair use policy is a clause that lets a provider slow you down or limit you once your usage runs far past what they consider normal, even on a plan sold as unlimited. The threshold is often buried in the fine print rather than shown up front. So unlimited does not always mean truly unlimited, especially for someone working online all day.
You buy an unlimited eSIM for a long stay and lean on it hard for video calls and uploads. Partway through the month your speeds drop to a crawl, because you crossed a fair use threshold you never saw advertised, and your work grinds along until the cycle resets.
An unlimited eSIM or roaming plan can still be slowed after a hidden threshold, undercutting heavy work use.
The difference is the whole point, so here is each one in a line.
A data cap is the stated maximum of data a plan allows before it slows down or charges more.
A fair use policy is the catch on plans sold as unlimited: a clause letting the provider throttle usage that far exceeds normal levels, so unlimited rarely means truly without limit.
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