ByteSIM does not offer an unlimited‑data eSIM for Saint Lucia. The plans sold are fixed data bundles. For example, the byteSim “Saint Lucia 10GB for 3 days” plan costs $47.90 and the “Saint Lucia 10GB for 15 days” plan costs $55.90, each providing 10GB of high‑speed data that must be used within the specified validity. For travelers who need more data, additional top‑ups can be purchased, but the plans themselves are limited to the 10GB allowance. Fixed data plans can be more cost‑effective for most users unless their usage exceeds the allotted data.