Is this SouthESIM plan valid for travel on the ferry to Helsinki (Finland) or the bus to Latvia (Riga) from Estonia?

For this specific plan, it's valid only within Estonia. If you're on a Baltic tour and planning to take the ferry across to Helsinki (Finland) or catch a bus to Riga (Latvia), your connection from this particular eSIM will unfortunately stop once you cross the border or enter international waters. For travelers exploring multiple Baltic or Nordic countries, we highly recommend looking into our regional SouthESIM plans, which are designed to keep you connected across several destinations without needing a new eSIM for each leg of your journey.