Best eSIM for Europe with Unlimited Data: AviaeSIM vs Holafly, Airalo and Saily (2026)

Every unlimited travel eSIM has a fair-use policy, and it is the first thing to read. On AviaeSIM's unlimited Europe eSIM you get full 4G/5G speed for 3 GB each day; once that is used, the connection stays on at 1 Mbps until the allowance renews — every 24 hours, counted from activation — which is enough for maps, messaging, email and music but not for HD video. There is no hard cut-off and nothing to top up. Airalo and Saily apply a similar daily allowance on their unlimited plans; Holafly sells the phone's own data as unlimited, under its fair-use terms, but limits how much you can share by hotspot each day. None of them is "unlimited" in the home-contract sense, and a plan that does not state its rule is one to avoid.

Three gigabytes a day is a lot in practice: a full day of navigation, photos, messaging and social media uses well under one, which leaves room for a couple of hours of video calls or standard-definition streaming. The travellers who hit it are the ones tethering a laptop, streaming for hours in the evening or on video calls all day — and for them the daily reset is the point, because a fixed 10 GB plan would be gone by day three.

Work out your daily use before choosing. Maps, messaging, email and social media: 100–300 MB a day. Add an hour of video or a few video calls: about 1 GB. Streaming films every evening, tethering a laptop, uploading video: 2–5 GB a day. For the first two groups, a fixed 5 or 10 GB plan over two weeks covers the trip and costs a fraction of any unlimited plan; for the third, an unlimited plan with a 3 GB-a-day rule is cheaper than buying and re-buying fixed data. Remote workers, families sharing one eSIM by hotspot and anyone whose work runs on cloud apps are the natural unlimited customers; a couple on a city break rarely is.

AviaeSIM sells unlimited Europe plans for 3, 5, 7, 10, 15 and 30 days in two versions. The 28-country version covers the 27 EU members plus the United Kingdom and is priced for trips that stay inside the EU. The 41-country version adds Switzerland, Norway, Iceland, Liechtenstein, Gibraltar, Turkey, Ukraine, Georgia and the Western Balkans — Albania, Bosnia and Herzegovina, Montenegro, North Macedonia and Serbia — for routes that leave the EU. Both run at full 4G/5G speed for 3 GB a day, then 1 Mbps; both are data-only, so calls run over WhatsApp or FaceTime and your own number stays active in the second SIM slot; and validity starts at the first connection in Europe, not at purchase, so the plan can be installed weeks ahead. The plan card names the exact country list and the current price; the Europe eSIM page lists the fixed-data alternatives on the same coverage.

Holafly is the unlimited specialist: every plan is unlimited, priced by the day, with hotspot sharing capped at a daily amount, and its Europe plan covers a broad list of countries. On a single country, compare the price per day: on 26 September 2026 Holafly's Czech Republic plan was $11.90 for 3 days and $73.90 for 30, and AviaeSIM's Czech unlimited plans are listed with today's price on the Czech Republic eSIM page. Beyond price, the choice comes down to the rule you prefer: Holafly's unlimited phone data with limited sharing, or AviaeSIM's 3 GB-a-day full speed with sharing counted inside it. For a traveller who tethers a laptop all day, AviaeSIM's 3 GB can run out; for one who streams on the phone alone, Holafly's hotspot cap never matters. Check each plan card on the day, since both providers change prices monthly.

Airalo sells unlimited plans in 130+ destinations, a regional Europe unlimited plan among them, and fixed-data plans everywhere; Saily, the NordVPN team's eSIM, sells fixed data from about $3.99 for 1 GB in most European countries and unlimited plans too, including a regional Europe one — Andorra's 30-day unlimited was $64.79 on the day this was checked. So all four providers here sell a regional unlimited plan for Europe: for a route across several countries, compare the price per day and the daily allowance, and let the country list decide.

Take two weeks in Italy, France and Spain. A traveller who navigates, messages and posts photos uses perhaps 400 MB a day — under 6 GB for the fortnight — and a 10 GB fixed plan on the Europe eSIM covers it with room to spare, at a price well below any 15-day unlimited plan. A traveller working remotely on video calls and streaming in the evenings uses 2–4 GB a day — 30–55 GB for the fortnight — and would need two or three 20 GB fixed plans, which on AviaeSIM's prices cost about the same as the 15-day unlimited plan — and the unlimited plan never needs a top-up. The break-even sits around 3 GB a day, which is also the unlimited plan's daily full-speed allowance: below it, fixed data is cheaper; around it, unlimited buys convenience.

The EU's roam-like-at-home rule protects EU and EEA contracts, not visitors, and it stops at the EU/EEA border — so Switzerland, the Balkans, Turkey and (since Brexit, on many contracts) the UK are where roaming bills are born. AviaeSIM's 41-country unlimited plan includes all of them; the 28-country plan includes the UK but not the rest. If your route touches Switzerland on the way from Milan to Paris, or takes the Dalmatian coast into Montenegro, buy the 41-country version and check the plan card's list. Countries on neither list — Moldova, Andorra, Kosovo, Belarus — have their own country eSIMs.

Buy the plan, receive the QR code by email, and install it at home over Wi-Fi: on an iPhone under Settings → Cellular → Add eSIM, on Android under Settings → Network & internet → SIMs (Samsung: Connections → SIM manager). Leave the eSIM switched off until the plane lands, then turn it on with data roaming enabled for that line only; the phone joins a local network on its own, and the 3 GB-a-day allowance starts with the first connection. Keep your home SIM in the second slot with its data roaming off, so it receives calls and bank codes without running up charges. The compatibility check confirms the phone supports eSIM, and how it works has the screens step by step.

For a route inside the EU and the UK, AviaeSIM's 28-country unlimited plan is the straightforward choice: 3 GB a day at full speed, daily reset, validity from the first connection, no promo code needed and any sale applied at checkout. For a route that includes Switzerland, Norway, Turkey or the Balkans, the 41-country version. For a traveller who tethers a laptop for a living and needs more than 3 GB a day, Holafly's unlimited phone data is worth its per-day price, hotspot cap and all. And for everyone who uses under a gigabyte a day, the honest answer is a 10 GB fixed plan on the same coverage — see the Europe eSIM page and the current deals.