Throttling is when a network deliberately slows your data speed, typically as a soft cap on heavy users or after you've used a certain amount of data on an "unlimited" plan.
How it works
You can still use data — pages load, apps work — but everything is slower. Streaming may drop to lower quality, large downloads crawl, video calls get patchy. Throttling usually resets at the start of your next billing month.
When it happens
- After hitting a Fair Use Policy roaming cap
- After hitting a soft cap on "unlimited" plans
- During congested peak hours on some plans
- After using a lot of tethered data on plans that limit it
How to check
Carrier websites publish throttle thresholds (sometimes buried). Fuse doesn't throttle — your plan's data limit is your real limit, no soft caps.
See also
How Throttling matters when picking a UK mobile plan
Understanding Throttling helps you compare mobile providers on a like-for-like basis. Most consumer mobile pricing pages skip the technical detail — knowing the terminology means you can spot when a plan is genuinely better and when it just sounds that way. The Fuse Mobile glossary keeps definitions short and consumer-focused, no jargon-on-jargon.
Fuse Mobile is a UK multi-network data-only eSIM — it gives your phone access to all four UK mobile networks (EE, Three, Vodafone, O2) through a single profile. Where Throttling is relevant to that setup, it's surfaced explicitly: pricing pages show real numbers, the coverage checker shows live per-network signal, and there's no hidden fee structure. See the plans page for the current pricing or read the multi-network eSIM explainer for the technical detail.