eSIM vs roaming vs local SIM card: which is cheapest for your trip?

The three options at a glance

The right choice depends mostly on two things: whether your home plan already includes the destination, and how long you stay. If you only need data and no local number, it gets simpler still: roaming inside a free zone, a travel eSIM almost everywhere else.

Roaming: when it is free and when it gets expensive

Roaming means your own SIM connects to a partner network abroad, and your carrier bills you for it. Whether that is cheap depends entirely on your tariff and the destination.

When roaming costs nothing extra

• EU and EEA residents in the EU and EEA: under the EU's “roam like at home” rules, extended until 2032, you use your normal allowance in the other EU countries plus Iceland, Liechtenstein and Norway. Operators may apply a fair-use limit to data on very cheap or unlimited plans, so check your tariff.
• Plans that include other countries: some home plans include roaming in selected countries or regions. Your carrier's website lists them.

When it gets expensive

Outside those zones, carriers usually sell day passes or charge per megabyte. A day pass is billed for every day you use your phone abroad, so a week quickly adds up. Pay-per-use data without a pass can be far more expensive still, which is how “bill shock” happens. Note that the EU rules do not cover Switzerland, the UK, Turkey or other non-EU neighbours; many EU tariffs charge extra there.

Travel eSIM: cheap data without changing your SIM

A travel eSIM is a prepaid data plan that you buy online and install on your phone before the trip. It runs alongside your normal SIM, so your number stays reachable for calls and SMS while the eSIM handles mobile data.

• Price: you pay once for a fixed amount of data or an unlimited plan with a daily fair-use limit. No daily fees, no surprises on the next bill.
• Choice: country plans, regional plans for several countries and global plans, from many providers. Comparing them is what our site is for.
• Limits: your phone must support eSIM and be unlocked, and most plans are data only. Calls work through apps like WhatsApp or FaceTime.

Here is what data costs on a destination where carrier roaming is often expensive for European travellers, the USA, with today's cheapest plan for each data amount:

To compare with your carrier, multiply its daily roaming fee by the number of days of your trip and set that against the plan in the table that matches your data needs. Our guide How much data do I need for travel? helps you pick the right size.

Local SIM card: cheapest for long stays, with some effort

Buying a SIM card from a local operator gives you local prices and a local number. For a stay of a month or more, that can be the cheapest option, especially in countries with low mobile prices.

The trade-offs are practical:

• Registration: many countries require you to register a SIM card with your passport, either at the counter or in an app.
• Where you buy matters: tourist packs sold at airports are convenient but often cost more than the same operator's offers in town.
• Your home number: unless your phone takes two SIMs (or one SIM plus eSIM), your home number is offline while the local SIM is in, including SMS codes from your bank.
• Language and opening hours: topping up or solving problems may mean a trip to a shop.

Some local operators also sell eSIMs to visitors, which removes the SIM swap but usually keeps the registration step.

Hidden costs to watch for

The headline price is only part of the bill. Each option has its own extras:

Roaming

• Automatic day passes: some carriers activate a paid day pass the moment your phone uses data abroad, even for a background update.
• Incoming calls and voicemail: outside free roaming zones, receiving calls or having them diverted to voicemail can be charged.
• Fair-use limits: even in free zones, data on very cheap or unlimited home plans may be capped abroad, with extra charges above the cap.

Travel eSIM

• Top-ups: buying extra data during the trip can cost more per GB than choosing a bigger plan at the start.
• Currency: if a provider charges in US dollars, your card may add a foreign currency fee. Our prices show which plans are converted from dollars.
• Daily limits on unlimited plans: after the daily full-speed allowance, the speed drops; that is not a cost, but it can push you to buy a second plan.

Local SIM card

• SIM and activation fees on top of the data package, plus higher tourist prices at airports.
• Unused credit usually expires and cannot be refunded when you leave.

Which option wins in which situation

• A week in another EU country, as an EU resident: roaming, as long as your tariff's data allowance is enough. Add a travel eSIM only if you need more data than your plan allows abroad.
• A holiday outside your free roaming zone: a travel eSIM, nearly always. It is usually a fraction of a week of day passes.
• A one-day trip or a short layover: roaming or a small 1–3 day eSIM. The price difference is small, so convenience decides.
• A business trip with a company phone: check whether the company plan includes roaming; if not, a travel eSIM with unlimited data keeps costs predictable.
• A stay of one month or more: compare a long travel eSIM plan with a local SIM. If you need a local number for apartments, deliveries or local apps, the local SIM wins.
• A multi-country trip: a regional travel eSIM covers all countries with one installation, which beats buying a local SIM in each country.

The best of both: keep your number, use an eSIM for data

Most phones sold in recent years can hold your home SIM and a travel eSIM at the same time. That setup gives you cheap data without losing your number:

1. Install the travel eSIM at home and check that your phone is unlocked; our guide How to check if your phone supports eSIM shows how.
2. On arrival, select the travel eSIM for mobile data and allow data roaming on that line.
3. Keep your home SIM switched on for calls and SMS, but with data roaming off, so it cannot use paid roaming data.
4. Remember that incoming calls and SMS on your home number may still be charged abroad, depending on your tariff. Wi-Fi calling, if your carrier supports it, can avoid that.

If the eSIM does not connect after landing, work through our checklist eSIM not working abroad? 10 fixes.