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Staying online in Spain
Madrid, Barcelona, Seville, Valencia, and Mallorca search for Spain. Mallorca is not a separate plan. The package must list ES.
Islands follow the country code
Mallorca finds Spain. It does not prove that a package covers the island unless ES is on that package.
Sevilla and Seville are the same search. Neither one changes the data allowance.
Check the phone first
The Spain page cannot see your device. Confirm Add eSIM in settings and that the phone is unlocked before you rely on a plan.