Roaming, a local SIM or a travel eSIM: which one fits your trip

Start with the map, not the price list

The first question is where you are going and where your plan is from. If your line is from an EU country and you travel inside the EU or the EEA, the roaming rules let you use calls, texts and data as you would at home, with nothing to switch on. We explain how that works, and where it stops, in roam like at home explained.

Outside that area there is no common rule. Switzerland, the UK, Turkey or Morocco cost whatever your operator decides, and two neighbouring countries can fall into different price zones. The same applies the other way round: a US or UK plan gets no EU protection inside the EU. So the same trip can point to different answers for two people sitting next to each other on the plane.

What your operator's roaming does well

Roaming asks nothing of you. Your SIM stays in, your number keeps receiving calls and texts, and there is nothing to install or register. Apple's own advice for travellers starts here: check with your carrier whether your plan already includes the countries you are visiting, or whether it sells travel passes you can add before you leave.

Its weak spots are cost and limits. Outside the EU, data can be expensive per megabyte, and even inside the EU an unlimited or very cheap plan can carry a fair use cap abroad. If you plan to rely on roaming, read how the EU fair use limit works and, for trips further away, how to avoid roaming charges outside the EU.

A local SIM: a number from the country, and a queue

A SIM from a local operator gives you that country's prices and, very often, a local phone number. Apple notes that many carriers sell prepaid plans that travellers can buy online before leaving or in person at an airport kiosk or shop. The catches are practical. Your phone has to be unlocked, many countries register each SIM to a passport at the counter, and on a phone with a single slot your own SIM has to come out, taking your number with it while the local one is in.

It makes most sense for long stays, or when people in that country need to call you on a local number: a landlord, a school, a company you are working with. What the counter asks for varies a lot by country, as we show in buying a SIM card at the airport.

A travel eSIM: the plan arrives before you do

A data eSIM is bought online and installed at home with a QR code, while you still have wifi. With Snoozim it only starts counting at its first connection in the destination, so installing it days earlier does not cost you any days. When you land, you switch off airplane mode and it connects.

Most travel eSIMs, Snoozim's included, are data only: no number, no calls, no texts. Your usual SIM stays in the phone for those, and WhatsApp keeps working with your own number because the account follows the number, not the line that provides the internet. The requirement is a phone that supports eSIM and is not locked to your operator, which you can check on our compatibility page.

Five questions that settle it

• Is your plan from the EU and is every country on your route in the EU or EEA? Then try roaming first.
• Do people in that country need to call you on a local number? Then you want a local SIM with a number.
• Do you want maps and a ride app the moment you leave the plane? Then set up the eSIM before you go.
• Is your phone locked to your operator or without eSIM? Then roaming or a physical local SIM are your options.
• Will you use a lot of data, or share it with a laptop? Then compare a destination plan against your roaming allowance.

If two answers point in different directions, the first two usually win: the price rules of your destination and whether you need a local number are harder to work around than convenience.

You can combine them

These options are not exclusive. A common setup is to keep your usual SIM for calls and bank texts with data roaming switched off on that line, and let a data eSIM handle the internet. That way nothing on your home line can run up data charges abroad, which we cover in how to turn off roaming on your home line.

On a long stay, the same logic works with a local SIM: the local line takes calls in that country while your home number stays reachable on the eSIM side or by text. For bank codes while you are away, see how to get bank SMS codes abroad.