A +91 phone in Andalusia
A traveller who keeps an Indian number on roaming is still a +91 contact. That matters more than it seems: Meta charges by the recipient's country code, not by where the phone happens to be, so a day plan sent to a +91 number in Sevilla costs what it would cost in Pune. A Spanish SIM bought on arrival would move the same message to Spain's line on the rate card.
The other thing that moves is the clock. Sevilla keeps Central European Time, an hour ahead in summer, so the gap with India is three and a half hours from late March to late October and four and a half in winter. A 08:30 day plan leaves India at noon in summer; a question asked after dinner in Sevilla reaches India after midnight.
Sevilla's own calendar, from Semana Santa to the Feria de Abril, reshapes tour days too, so keep the day-plan template flexible: entry time, meeting point and guide as variables, not fixed text.
