Fair Use Policy (FUP)
Fair Use Policy (FUP) is a contractual term used by mobile carriers and eSIM providers to define the threshold at which a nominally 'unlimited' data plan will be subject to speed reduction or deprioritization; Carriers implement FUP enforcement at the gateway level using deep packet inspection (DPI) or usage accounting in the policy and charging rules function (PCRF); When evaluating travel eSIM plans, the FUP threshold is often more important than the advertised headline speed
Fair Use Policy (FUP) is a contractual term used by mobile carriers and eSIM providers to define the threshold at which a nominally ‘unlimited’ data plan will be subject to speed reduction or deprioritization. Once a subscriber crosses the FUP threshold (commonly 1 GB to 20 GB depending on the plan), the carrier may reduce throughput to 64 Kbps to 512 Kbps for the remainder of the cycle. The policy exists to prevent a small number of heavy users from congesting shared network infrastructure.
How it works
Carriers implement FUP enforcement at the gateway level using deep packet inspection (DPI) or usage accounting in the policy and charging rules function (PCRF). When the subscriber’s data counter reaches the defined cap, the PCRF pushes a new Quality of Service (QoS) profile to the gateway, downgrading the bearer to a lower bandwidth class. Some providers offer top-up add-ons that restore full-speed data before the cycle resets.
Key facts
- Common thresholds: Travel eSIM FUP limits frequently range from 1 GB (budget plans) to 20 GB (premium plans) before throttling
- Throttled speeds: Post-FUP speeds of 64 Kbps to 512 Kbps support messaging and maps but make video calls and large uploads impractical
- Top-up option: Many eSIM providers sell data add-ons that restore full speed without waiting for the next billing cycle
For builders
When evaluating travel eSIM plans, the FUP threshold is often more important than the advertised headline speed. A plan marketed as ‘4G/LTE unlimited’ with a 1 GB FUP will throttle aggressively during a typical workday involving video calls and file uploads. Builders should calculate their daily data needs, multiply by trip length, and select a plan whose FUP limit comfortably exceeds that estimate.
Sources
- GSMA. eSIM specifications and consumer protections. gsma.com
- BEREC. EU electronic communications regulators publications, including roaming. berec.europa.eu
- European Commission. Roam-like-at-home and fair use policy framework. digital-strategy.ec.europa.eu
- FCC. Cell phone unlocking, MVNO, and consumer protection FAQs. fcc.gov
- GSMA. Mobile spectrum positions and network policy. gsma.com
