Roaming4You does not provide a truly unlimited high‑speed data eSIM for Portugal.
The plans listed as “Portugal Unlimited Data” give a fixed allowance, such as 1 GB for a 1‑day period or 1 GB per day up to 30 days; after the allowance is reached the data speed is normally slowed, so the package is not unlimited.
If you need a larger data allowance, Roaming4You offers fixed data plans that can be purchased for 7 days, 10 days, 15 days, or 30 days, each providing a set amount of high‑speed data. These plans may be more cost‑effective unless you are an extremely heavy data user.