Find countries CheapereSIM sells eSIM plans for, by full or partial name. Use this when the user names a place and you need its country code before looking up plans. Do not use it to compare prices or list plans: use list_plans for a single country, or plan_trip for several.

List eSIM plans for one country, cheapest first. Use plan_trip instead when the user is visiting more than one country.

List the destinations travellers buy eSIMs for most often, with a starting price for each. Use this only when the user has not named a destination and wants ideas. If they already named one country use list_plans, and if they named several use plan_trip.

Work out the cheapest way to stay connected across several countries. Compares one regional plan covering the whole trip against buying a local plan per country, and says which is cheaper. Use this whenever the user names more than one destination.

List every country a regional or global plan covers. Takes the group_id from a plan returned by plan_trip or list_plans. Local plans have a null group_id and cover only their own country.