You land after a long flight, your phone finds a network, and then the question hits you: how are you actually going to get data for the next week or two? Most travelers end up choosing between three options. Stick with your home carrier and let it roam, hunt down a local SIM card once you land, or set up a travel eSIM before you even leave the house. Each one works. None of them is automatically the "right" answer, because the best choice depends on your trip, your phone, and how much hassle you're willing to put up with.
This guide walks through how each option actually works, what it costs you in time and money, and which one tends to fit which kind of traveler. By the end you should be able to make the call for your own trip without second guessing yourself at the airport.
The three ways to get connected abroad
Before comparing them, it helps to know what each one actually is, because they solve the connectivity problem in very different ways. One works through your existing carrier, one swaps in a new physical card, and one lives entirely inside your phone's software. Once you see how each one connects you to a network, picking between them gets a lot easier.
Home carrier roaming
Roaming means using your existing phone plan while traveling. Your phone connects to a partner network in the country you're visiting, and your home carrier bills you for it, either through a roaming add on or, in some cases, at standard rates. The big appeal is that it requires zero setup. You land, your phone connects, and you're online. The tradeoff is that international roaming has traditionally carried a steep premium compared to buying data locally, since you're paying your home carrier to broker access to a foreign network rather than buying that access directly.
There's one major exception worth knowing about. Since 2017, the EU's "Roam Like At Home" rule has meant that people with a SIM from an EU or EEA country pay their normal domestic rates when traveling within the EU, Iceland, Liechtenstein, and Norway. So a French traveler using a French SIM in Italy pays French prices, not a roaming surcharge. If you're coming from outside that zone, though, don't assume the same deal applies to you.
If you're a UK traveler, be aware that since Brexit, EU roaming is no longer guaranteed to be free on every plan. Some UK carriers still include it, others have brought back charges or data caps, and it varies by operator and by plan, so it's worth checking your own carrier's current terms rather than assuming.
A local physical SIM card
This is the classic backpacker move: land, find a phone shop or a SIM vending machine, buy a local prepaid SIM, and swap it into your phone. It's often the cheapest option per gigabyte, especially in countries where local mobile data is inexpensive. But it comes with real friction. Your phone has to be network unlocked, meaning it isn't locked to your home carrier, or the local SIM simply won't work. In a lot of countries you'll also need to show a passport or other ID to register the SIM, since mandatory registration for prepaid SIMs is common practice in many places, though the exact rules vary by country and do change over time.
The other catch is that once you pop out your home SIM, it's gone from the phone unless you have a device with two physical SIM trays. That means calls, texts, and anything relying on your home number, including SMS codes for two factor authentication, stop working unless you set up call forwarding before you left.
A travel eSIM
An eSIM is a digital SIM built into your phone's hardware. Instead of a physical card, your carrier's subscription details are downloaded straight onto a chip already inside the device, usually by scanning a QR code or tapping an activation link. You can do this before you even leave home, while you're still on your own Wi-Fi, and many travel eSIM plans simply sit there inactive until you land and your phone connects to a partner network abroad. No shop, no queue, no fumbling with a tiny SIM tray tool in an airport.
Because it's digital rather than a physical swap, an eSIM can usually sit alongside your home SIM. Most phones that support eSIM can keep your regular number active for calls and texts while the eSIM handles data, though exactly how many profiles can run at once depends on the phone model and generation, so it's not a one size fits all number. If you want to check whether your own phone supports this, our eSIM compatible devices page keeps an up to date list rather than relying on a guess.
Which one is actually cheapest?
As a general pattern, roaming through your home carrier tends to be the most expensive way to get data abroad, because you're paying a premium for convenience and for your carrier acting as the middleman. A local SIM is often the cheapest per gigabyte, since you're buying directly from a carrier in the country you're visiting. A travel eSIM usually lands somewhere in between, but closer to the local SIM in price, while skipping the hassle of finding a shop and dealing with a language barrier at the counter.
Exact prices shift constantly and vary by carrier, country, and plan, so it's not something to pin to a specific number. The pattern that holds up, though, is this: convenience costs money, and roaming is the most convenient of the three by default, which is exactly why it tends to cost the most.
Which option fits which trip
Rather than picking one option for every trip, it helps to think about what kind of traveler you actually are for this particular journey. A quick work trip has completely different needs than a two month backpacking route. Match the option to the trip, not the other way around.
Short business trips
If you're in one country for a few days and don't have time to deal with anything, roaming or a pre-set-up travel eSIM are your best bets. Both work the moment you land, with no shop visit required. A travel eSIM is usually the cheaper of the two, and since you can activate it before you fly using our eSIM setup guide, there's genuinely no extra effort involved compared to roaming.
Long backpacking or multi-country trips
Over weeks or months, roaming costs add up fast, so it's usually the weakest choice for this kind of trip. A local physical SIM bought fresh in each new country can be the cheapest route if you don't mind the repeated hassle of finding a shop and registering your ID every time. If you'd rather not deal with that in every new country, a regional or multi-country eSIM plan, like our global eSIM option, gives you similar savings with a lot less repeated setup.
The occasional traveler
If you travel now and then and just want things to work without thinking too hard about it, a travel eSIM tends to be the best balance. It's cheaper than roaming, and unlike a local SIM, there's no shop to find and no ID paperwork on arrival. The one requirement is that your phone needs to be unlocked and eSIM capable, which is worth confirming before you travel rather than at the airport.
Helpful tips
- Check your phone is unlocked before you travel. Both a local SIM and a travel eSIM need this, and a locked phone limits you to roaming whether you want that or not.
- Set up your eSIM before you fly. Most providers let you install the profile in advance and only activate the data plan once you land, so you're online the moment you land instead of hunting for Wi-Fi to download it.
- If you're heading to Europe, look up whether your specific plan still includes EU roaming, since this has changed for some carriers since Brexit and isn't the same across every provider.
- Keep your home SIM active in the second slot if your phone supports it, so your regular number still works for calls, texts, and any two factor codes tied to it.
- For a region with lots of border crossing, like a European trip that touches several countries in a short window, our Europe eSIM page covers plans that work across the whole region instead of needing a new SIM at every border.
Common mistakes
- Assuming your home plan includes free roaming everywhere. Some destinations are covered, many aren't, and the charges when they apply can be steep.
- Buying a local SIM without checking your phone is unlocked first, then discovering it at the counter with no backup plan.
- Forgetting that swapping in a local SIM knocks out your home number, and not setting up call forwarding in advance for anything important.
- Waiting until landing to install a travel eSIM, then struggling to find Wi-Fi to download the profile. Set it up before you leave instead.
- Not confirming eSIM support on an older or budget phone. Not every unlocked phone has the hardware for it, so it's worth a quick check rather than an assumption.
Frequently asked questions
Can I use roaming and an eSIM at the same time?
Yes, on most eSIM capable phones you can keep your home SIM active for calls and texts while your travel eSIM handles data. They don't conflict with each other since one is physical and the other is digital.
Do I need to unlock my phone for a travel eSIM?
Generally yes. Both a local physical SIM and a travel eSIM need an unlocked phone to connect to a carrier other than your home one. If your phone is locked to your carrier, roaming is your only option until you get it unlocked.
Is a travel eSIM more reliable than a physical local SIM?
Reliability comes down to the network the eSIM or SIM connects to, not the format itself. What an eSIM does offer is a smoother setup, since you install it in advance instead of hoping a shop has stock and decent English. If you do run into connection issues, our guide on what to do when an eSIM isn't working covers the most common fixes.
Will my home number still work if I use a travel eSIM?
On most phones, yes. Since the eSIM is a separate digital profile, your physical home SIM can usually stay in place, so calls and texts to your regular number keep working while the eSIM handles data.
How do I know if my phone supports eSIM?
Most phones released in the last few years support it, but not all, and support varies more on Android than on iPhone. Rather than guess, check the eSIM compatible devices list mentioned above, which we keep updated as new models come out.
Conclusion
There isn't one option that wins every time. Roaming is the path of least resistance for a short trip where cost matters less than convenience. A local SIM tends to win on pure price for a long trip where you don't mind the setup. A travel eSIM sits in the sweet spot for most other trips: cheaper than roaming, easier than hunting down a local SIM shop, and something you can sort out from your couch before you even pack a bag.
If you're weighing up your next trip and want to see current plans and coverage for where you're headed, our destination and region pages are a good place to start. Every plan we list is checked using the same process we explain in our guide on how we test eSIMs, so you know what you're actually getting before you buy.