Estonia
eSIM.Fast 5G data plans. Instant activation, no SIM swap.

The best Estonia eSIM runs on Telia and Tele2, with 5G across Tallinn and Tartu and coverage extending properly into rural areas and the islands — noticeably better than Estonia's size and population density would suggest, because the country treats connectivity as national infrastructure. Plans are prepaid with no contract, your QR code arrives by email within seconds, every plan includes free mobile hotspot, and there's a 7-day money-back guarantee. Two honest notes: Estonia is an EU member so an EU SIM may already cover you, and most visitors combine Estonia with Latvia and Lithuania, in which case the Europe regional plan covers the whole route.

Getting online in Estonia takes about two minutes. Confirm your phone supports eSIM — iPhone XS (2018) and newer and most Android flagships from 2020 qualify. Choose your Estonia plan on Flysimio and pay with card, Apple Pay, or Google Pay; your QR code arrives by email within seconds. On Wi-Fi before you travel, open Settings → Cellular → Add eSIM (iPhone) or Network & Internet → SIMs → Add eSIM (Android) and scan it. Switch the line on at Lennart Meri airport and turn on Data Roaming for that line only. If you're arriving by ferry from Helsinki — a two-hour crossing many visitors make — switch it on as you dock at Tallinn.

Genuinely less than almost anywhere in Europe. Estonia's public Wi-Fi is fast and near-universal, so a week in Tallinn typically uses 1–2 GB even for heavy phone users. A 3 GB plan comfortably covers a fortnight including the islands. Coverage is not a constraint anywhere a visitor goes: Tallinn's medieval Old Town, port and airport are all on 5G, Tartu is covered, Saaremaa and Hiiumaa have signal across both islands and on the ferry crossings. The thinner spots are the Lahemaa forest interior and the raised bogs at Soomaa, so download an offline map before boardwalk hikes.

Flysimio runs as a second line beside your usual SIM, so you keep your home number for calls and texts while your Estonian data flows over the eSIM — standard dual-SIM behaviour on iPhone XS and later and most Android phones from 2018. Set the Flysimio eSIM as your cellular-data line and turn on Data Roaming for that line only; it simply lets the eSIM connect to Estonian networks, with no roaming fees. Keep your home SIM on for messages and calls, or switch it off to avoid your own carrier's charges.

Every Flysimio Estonia plan includes mobile hotspot at no extra cost and without throttling, so you can tether a laptop or tablet or share with a travel companion. As a data-only eSIM it has no Estonian phone number, but that matters less here than almost anywhere: Estonia is the most digitally advanced country in Europe by most measures, close to cashless, and nearly everything from parking to museum tickets is handled online. WhatsApp, FaceTime and Google Meet cover calls and messages over data, and your home number stays reachable on your primary SIM.

For a Tallinn city break or a day trip across from Helsinki, the 1 GB / 7-day plan is the economical choice. For a week or more adding Tartu, Lahemaa and the islands, a 3–5 GB plan gives you room to spare. Because Flysimio gives you six months to activate, you can buy before you leave and validity only starts when your eSIM first connects in Estonia. If you're doing the classic Baltic route — Tallinn to Riga is about four hours by bus, Riga to Vilnius another four — buy the Europe regional plan rather than three separate country plans.