Coverage in Alexandroupolis itself is reliable — every major Greek network covers the city centre, the promenade, and the airport without issue. The gap shows up once you're on the ferry or out in the Evros Delta, where signal thins out well before you'd expect it to.
If you're arriving from outside the EU, a physical Greek SIM still means finding a kiosk, having your passport on hand, and occasionally a short wait. An eSIM installed before you fly skips all of that — you land with data already working, which matters more than usual here since the ferry terminal and the airport are both a taxi ride from the SIM shops in town.
EU visitors already get roaming included under EU rules, so an eSIM mostly matters for everyone else — UK, US, and other non-EU travellers passing through on the way to Samothraki.
Buy a Greece or Europe-wide plan sized to your trip length before you go, install it while you still have wifi, and switch it on when you land. It's a five-minute job that saves the first confused hour in a new city.
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