ZenSim does not provide a truly unlimited data eSIM for Guernsey. All of the plans listed for the destination are fixed‑data packages that include a hard data allowance measured either in gigabytes or in a per‑day amount. For example, ZenSim offers a 30‑day plan with 3GB per day, a 30‑day plan with 40GB of high‑speed data, and a 30‑day plan with 20GB of data.
These fixed‑data plans may contain large data allowances, but the amount must be used within the specified validity period, and consumption beyond the stated limit would trigger a speed reduction (for the 3GB/day plans the speed drops to 1000kbps after the daily cap is reached). Choosing a fixed‑data plan can be a cost‑effective way to stay online while traveling in Guernsey unless you anticipate very heavy data usage.