Three ways to get data abroad, and the right one depends on how long you are staying, how many countries you are visiting and how much friction you will tolerate. Roaming is the least effort and usually the most expensive. A local SIM is usually the cheapest and takes a shop visit. An eSIM sits in between and is arranged before you fly.
The short version
- Roaming: zero setup, works on landing, most expensive per gigabyte.
- Travel eSIM: set up at home, cheap data, needs an unlocked eSIM-capable phone.
- Local SIM: usually cheapest, needs a shop, sometimes a passport, and a new number.
- Short trip, one country, light use: a carrier travel pass is often fine.
- Multi-country or longer: an eSIM covering the region usually wins.
What You Need to Know
Roaming
Your own number and plan, used on a foreign network. Nothing to set up, calls and texts to your number arrive normally, and two-factor authentication codes sent by SMS keep working, which matters more than people expect. The cost varies enormously by carrier and country, from included at no extra charge to a rate that produces a memorable bill. A daily travel pass is the middle option most carriers now sell.
Travel eSIM
A data plan downloaded to your phone before you leave, from a provider that sells short-term travel data. It activates on arrival, it is usually far cheaper per gigabyte than roaming, and it can be bought for a single country or a whole region. It requires a phone that supports eSIM and is not carrier-locked, and most travel eSIMs are data only, so your usual number stays reachable only if you keep your normal SIM active alongside it.
Local SIM
Bought at the destination, usually the cheapest data of the three, and often the best coverage since it is a domestic plan. The costs are friction: finding a shop, sometimes registering with a passport, and getting a local number that nobody who knows you has. Of the 211 destinations the State Department publishes country information for, 17 discuss buying or registering a local SIM.
Choosing
- Two or three days, one country, maps and messaging: a carrier travel pass, or an eSIM if you are comfortable setting one up.
- A week or more, one country: eSIM or local SIM. The saving becomes real.
- Several countries: a regional eSIM, which avoids a shop in each one.
- You must keep your own number reachable: keep roaming enabled for calls and texts and use an eSIM for data, which most modern phones do simultaneously.
What to Do Before Your Trip
- Get your carrier’s actual numbers so you have something to compare against.
- Confirm your phone is unlocked and eSIM-capable before buying anything.
- Install and test an eSIM at home if you buy one, rather than at an airport.
- Decide whether you need your own number to keep working.
- Check SIM registration rules for the destination.
Deciding for a group? Do not mandate one answer. Phones differ, plans differ, and the traveler with a locked handset needs a different route from everyone else.
Explore group travel planningImportant Considerations
Two-factor authentication is the quiet trap. Codes sent by SMS go to your usual number, so a traveler who removes their normal SIM and relies on a data-only eSIM can find themselves unable to log into a bank or an airline. Either keep the original SIM active for texts, or move your authentication to an app before you travel.
The other quiet trap is comparing headline prices without the units. An eSIM at a low price for one gigabyte and a travel pass at a higher price for unlimited daily use are not comparable until you know how much data you actually use. Look at a normal month at home and assume travel is heavier, because maps and translation are constant.
Tips for Group Travelers
- Send the comparison early, so people arrange it before the airport.
- Expect three different answers in one group, and let them differ.
- Check who has a locked phone; they will need roaming.
- Make sure two people have reliable data, whatever route they took.
- Warn about SMS two-factor before anyone removes a SIM.
Common Mistakes to Avoid
- Buying an eSIM for a locked phone.
- Removing the SIM that receives your two-factor codes.
- Setting up an eSIM for the first time at the airport.
- Comparing prices without comparing data allowances.
- Assuming a local SIM is always cheapest on a short trip, once the shop visit is counted.
Frequently Asked Questions
Is an eSIM cheaper than roaming?
Usually yes per gigabyte, sometimes dramatically, but it depends on your carrier: some plans include roaming in certain countries at no extra cost, in which case roaming wins on both price and effort. Get your carrier’s real numbers first, then compare.
Can I use an eSIM and keep my normal number?
On most modern phones, yes. You keep your usual SIM active for calls and texts and use the eSIM for data. That combination is often the best answer, because it keeps SMS two-factor codes arriving while giving you cheap data.
Should I buy a local SIM at the airport?
Airport kiosks are convenient and generally more expensive than a shop in town, which is the same pattern as currency exchange. If you need connectivity immediately, an eSIM arranged before departure avoids the choice entirely.
What about visiting several countries?
A regional eSIM usually wins, because it avoids buying a SIM in each country and avoids per-country roaming charges. Check the exact country list before buying: regional plans have boundaries that do not always match how travelers think of a region.
Related Travel Tips
- Phones, technology and connectivity, the section this guide belongs to.
- How eSIMs Work. The mechanics, in detail.
- Using Your Phone Internationally. The carrier questions.
- Internet Access Abroad. When data is not the answer.
Plan Your Trip With LABUSA Travel
How many countries an itinerary crosses, and whether coverage is dependable in each, decides which of these three is right. LABUSA Travel can answer both before you buy anything.
Talk with a LABUSA Travel advisor about a trip you are considering, or browse our destination guides for a specific country.
Verify Before You Travel
SIM registration rules are published per destination by the U.S. Department of State and independently by Global Affairs Canada. Roaming rates, travel passes, lock status and eSIM support are set by your carrier and your handset maker, and only they can confirm them.
Travel requirements, health guidance and safety conditions can change. Always confirm current requirements with the appropriate government or official authority before departure.