Last updated: 20 October 2026
A travel SIM, or international SIM, is a SIM card or eSIM sold for using your phone abroad, usually for data. You have three ways to get one: a physical travel SIM card shipped to you before the trip, a local SIM card bought after you land, or a travel eSIM you download in a few minutes. For most recent phones the eSIM is the easiest: nothing to ship or swap, and your US number stays active for calls, texts and bank codes. A physical SIM card still makes sense if your phone does not support eSIM: check yours in 30 seconds.
Going to several countries? Our Global eSIM covers 170 countries on one plan: $17.99 for 7 days with 1.5 GB a day.
Your three options
| Physical travel SIM, shipped | Local SIM at the airport | Travel eSIM | |
|---|---|---|---|
| How you get it | Ordered online, mailed to you before the trip | Bought at a counter or shop after you land | Bought online, installed with a QR code or link |
| When it works | Once it arrives and you swap it in | Once you find a counter, queue and register | As soon as you land, installed at home |
| Your US number | Out of reach while your US SIM is out, unless your phone has two slots | Out of reach while your US SIM is out, unless your phone has two slots | Stays active next to the eSIM on any phone with an eSIM |
| Paperwork | Usually none | Often a passport, and in some countries ID registration | Usually none |
| Best for | Phones without eSIM | Long stays, or phones without eSIM on a short notice trip | Most recent phones, short and multi-country trips |
A physical travel SIM shipped before you go
A travel SIM card works like any SIM: you take out your US SIM and put the travel one in. Plan for the shipping time, and for the swap itself. With your US SIM out, texts to your US number, including bank and two-factor codes, do not reach you until you put it back, unless your phone has a second slot or an eSIM to keep your US line on. Keep the tiny US SIM somewhere safe: losing it on a trip means a trip to your carrier at home.
A local SIM at the airport
Buying from a local carrier gets you local rates, and on a long stay it can be the cheapest option. The catches are the queue at arrivals, opening hours, and paperwork: many countries now require a passport to register a SIM, and some cut off unregistered lines. Mexico is one example: the new registration rule. Our airport guides, such as Tokyo Narita, say where the counters are and what to bring.
A travel eSIM
An eSIM is a SIM built into your phone: you buy the plan online, install it at home on Wi-Fi, and switch its data on when you land. Your US line stays in place for calls and texts while the eSIM carries the data, so codes from your bank still arrive. Examples from our catalogue, checked on 20 October 2026:
| Trip | Plan | Price |
|---|---|---|
| A week in Europe (30 countries) | 1.5 GB a day, 7 days | $11.99 |
| A week in Japan | 1.5 GB a day, 7 days | $11.99 |
| Several regions, 170 countries | 1.5 GB a day, 7 days | $17.99 |
| A long trip with little use | 5 GB over 30 days, 170 countries | $20.99 |
How an eSIM and a SIM card differ technically is in eSIM vs physical SIM. This page is about which one to buy for your trip.
Before you buy any travel SIM
Your phone must be unlocked. A phone locked to Verizon, AT&T or T-Mobile only accepts that carrier's SIM, physical or eSIM. A phone still being paid off is often locked: how to check and unlock.
A US iPhone takes no SIM card. Every iPhone sold in the US since the iPhone 14 is eSIM only, so a physical travel SIM will not fit: what eSIM-only means for travel.
"Unlimited" rarely means unlimited at full speed. Many unlimited travel SIMs and eSIMs slow you down after a daily allowance or under a fair-use policy. Read the speed after the cap, not just the headline: fixed, daily or unlimited data.
Check every country on your route. A "global" SIM covers a list of countries, not all of them. Compare the list with your itinerary, including stopovers and cruise ports.
Is a travel SIM cheaper than your carrier?
Usually. Verizon and AT&T charge $12 a day per line to use your plan abroad, so a week costs $84 per phone, against $11.99 for a week of data in Europe on a travel eSIM. Some plans include roaming, such as T-Mobile's Experience plans and most unlimited plans in Mexico and Canada. Carrier by carrier: will my phone work in Europe?, Verizon, AT&T and T-Mobile.
Which travel SIM for which trip
- One country, one week: a country or regional eSIM. For Europe, one eSIM covers 30 countries: eSIM for Europe.
- Several regions: a global plan, which costs more per gigabyte but saves switching: global vs regional plans.
- A phone without eSIM: a physical travel SIM shipped before you go, or a local SIM on arrival. More options in my phone doesn't support eSIM.
- A long stay of a month or more: compare a local SIM's monthly price with a 30-day eSIM.
Comparing providers? Our Airalo alternatives puts six travel eSIM stores side by side.
FAQ
What is the best international SIM card?
The one that covers every country on your trip, works with your phone and leaves your US number on. For most recent unlocked phones that is a travel eSIM: there is nothing to ship, and your US line keeps receiving calls and texts. If your phone has no eSIM, a physical travel SIM shipped before you go, or a local SIM on arrival, does the same job.
Do travel SIM cards work in every country?
No. Each travel SIM or eSIM covers a list of countries, even the ones sold as global. Check the list against every stop on your trip, including layovers and cruise ports, before you buy.
Is an eSIM better than a travel SIM card?
For most travelers with a recent phone, yes. An eSIM installs in minutes, needs no shipping and no swapping, and lets your US SIM stay in the phone for calls and texts. A physical travel SIM is the choice when your phone does not support eSIM.
Can I keep my number with a travel SIM?
With a travel eSIM, yes: your US line stays active next to it, so you still receive calls and texts, including bank codes. With a physical travel SIM, only if your phone has a second slot or an eSIM for your US line; on a single-slot phone your number is out of reach while the travel SIM is in.
Do I need an unlocked phone for a travel SIM?
Yes. A phone locked to a US carrier only accepts that carrier's SIM or eSIM. Ask your carrier to unlock it before you travel; phones still being paid off are often locked.
Facts checked on 20 October 2026 against our catalogue, Apple's US iPhone specifications as summarized in our iPhone guide, and our Verizon, AT&T and T-Mobile guides (carrier prices as listed in October 2026).