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If your trip is outside the EU, the phone bill can easily become very expensive. We recommend getting a local prepaid subscription. It is advisable to check their availability before your trip, and often it is possible to order them in advance by mail. eSIMs for international travel are sold by, for example, https://www.airalo.com/fi/.
You can also consider using wireless networks in hotels or host organizations with your phone, but always use a VPN connection for security purposes.
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