ByteSIM does not offer a truly unlimited data eSIM for Portugal. The plans it calls “Portugal Unlimited Data” provide only 1GB of high‑speed data each day and, after that limit is reached, the speed is reduced to 10240 kbps. The prices for these plans range from $4.90 USD for a 1‑day pass to $59.90 USD for a 30‑day pass, all with the same 1 GB/day allowance and reduced speed once the cap is hit.
Instead, ByteSIM provides fixed‑data options that may be more cost‑effective for heavier users. For example, the 50GB plan is available for 3 days at $40.90 USD and for 15 days at $51.90 USD. These plans give a larger high‑speed data allowance with no daily reduction, making them suitable for travelers who expect to use more data.