ZenSim does not provide a truly unlimited data eSIM for Belgium. Their plans called “Unlimited” actually give a daily high‑speed allowance of 3 GB for the validity period; once the 3 GB/day quota is reached the data speed is throttled, although the specific reduced speed is not listed in the available data.
Customers who need more data can choose ZenSim’s fixed‑data plans. For example, a 20 GB plan for 10 days is priced at $23.00 USD, a 20 GB plan for 30 days at $24.00 USD, or a 10 GB plan for 10 days at $15.00 USD. These plans give a larger total data allowance, which may be more cost‑effective for travelers who expect heavy usage.