Best Connect eSIM does not provide an unlimited data plan for Spain. All of its available plans for that country have a fixed data cap, ranging from 5GB up to 30GB, with validity periods of 7 or 30 days and prices from $6.00 USD to $20.00 USD.
If unlimited data is not required, a fixed plan may be more economical. For example, the Europe EU 30 GB Data for 30 Days plan costs $20.00 USD, while the Europe EU 20 GB Data for 30 Days plan costs $14.00 USD. These options offer substantial data allowances and may be preferable for moderate to heavy usage, unless a traveler needs truly unlimited data.