AeriSIM does offer unlimited data eSIM plans for Belgium. The provider sells 5G‑enabled plans that remain active for between 1 and 30 days, with prices ranging from about $2.21 for a 1‑day plan up to $44.98 for a 30‑day plan. Each plan allows tethering, but normal data speeds may be throttled after heavy use; the maximum advertised speed is 5, 000 kbps for most plans (10, 000 kbps for the 1‑day option). If you are concerned about potential speed restrictions, contact AeriSIM to confirm the Fair Usage Policy and the typical data amounts that remain available at normal speed.