What is a Fair Usage Policy (FUP) on unlimited data?

A Fair Usage Policy (FUP) is a data threshold above which your provider may reduce your speeds. Most travel eSIM providers set this as low as 1-2GB per day, effectively throttling your speeds after a single Netflix movie or video call. Jolli's UK Unlimited plan has a generous 650GB per month FUP — enough for extreme heavy users without ever feeling throttled.