Quick answer: For most trips of about two weeks or less, a travel eSIM beats a local SIM: you install it before you fly and get online the moment you land. Choose a local SIM when you need a local phone number or plan to stay for months. Both work only if your phone is unlocked.
What is the difference between a travel eSIM and a local SIM?
A local SIM is a plastic card from a mobile company in the country you visit. You buy it at an airport kiosk or a shop, then slide it into your phone's SIM tray. An eSIM is the same kind of plan, but it lives as a downloadable profile on a small chip inside your phone, so there is no card to handle.
Apple describes an eSIM as a digital SIM built into the iPhone. Think of it like a boarding pass on your phone instead of a paper ticket. The trip is the same; the paper is gone.
You can also get an eSIM from a local carrier. Apple lists local carrier eSIMs and worldwide provider eSIMs as separate options for travelers. A travel eSIM from a worldwide provider is the one this article compares with a local SIM card.
Travel eSIM vs local SIM: side by side
| Question | Travel eSIM | Local SIM card |
|---|---|---|
| Where you buy it | Online, before you leave | Airport kiosk or local store, after landing |
| What you need | An eSIM-compatible, unlocked phone and Wi-Fi for setup | A SIM tray, an unlocked phone, and sometimes ID |
| Phone number | Usually data only | Often includes a local number |
| Home number | Stays active on your home line | Needs a second SIM slot, or you swap your home SIM out |
| Countries covered | One country, a region or the world | One country |
| Risk | Phone may not support eSIM | Queues, lost home SIM, tray tool needed |
The row about phone numbers needs care. Apple says local carriers' plans often come with a local phone number, and that you can buy them online or at an airport kiosk or store. The same page notes some places may ask for ID such as your passport.
Is a travel eSIM cheaper than a local SIM?
It depends on trip length, and we will not guess at local SIM prices we have not checked. Read the price on the counter, then compare it with a travel eSIM for the same days and gigabytes.
Travel eSIM prices are easy to check in advance. The eSIMzee catalog lists Thailand eSIM plans from $0.49. Examples from the catalog, checked on 23 October 2026:
| Provider | Plan | Data | Validity | Price in USD |
|---|---|---|---|---|
| Thirr | Thailand, short stopover | 1 GB | 3 days | $0.77 |
| Abest eSIM | Thailand, one week | 5 GB | 7 days | $3.48 |
Prices from the eSIMzee catalog, checked on 23 October 2026. Providers change prices often.
For a short trip, you pay for a small, fixed bundle and skip the airport detour. For a long stay, you will use far more data, so compare the monthly price of a local plan against the eSIM total.
Can I keep my home number with a travel eSIM?
Yes, if your phone supports two lines. A phone that holds a travel eSIM and your home SIM keeps both active. Apple says that keeping your home line active lets you keep your home number and iMessage and FaceTime while the travel eSIM carries your data.
Google says Pixel 3a and later phones can run one physical SIM and one eSIM at the same time. With a local SIM card, you need a free slot for it. On a phone with one SIM tray, that usually means taking your home SIM out and storing it safely.
Do I need an unlocked phone?
Yes, for both. Apple tells travelers to check Settings, General, About, and look for "No SIM Restrictions" next to Service Provider Lock, as described on its travel eSIM page.
Also check that your phone supports eSIM at all. Use the eSIMzee device checker before you buy.
How do I pick: eSIM or local SIM?
- Choose a travel eSIM for trips of about two weeks or less, trips through several countries, late arrivals, and anyone who wants to keep a home number.
- Choose a local SIM if you need a local phone number for bookings or deliveries, plan a long stay, or your phone has no eSIM support.
- Combine both on a dual SIM phone: a travel eSIM for the first days, then a local plan once you settle in.
Not sure how much data you need? Try the data calculator, then compare plans from each provider.
Frequently asked questions
Can I buy a travel eSIM at the airport?
You do not need to. Install it at home on Wi-Fi, because Apple notes setup needs a Wi-Fi connection. You then connect on landing.
Do local SIMs require a passport?
Some do. Apple says some places may ask for ID such as your passport when you buy a local plan. Ask at the counter before you pay.
Will iMessage and FaceTime still work with a travel eSIM?
Yes. Apple says that if you use only the travel eSIM, FaceTime and iMessage continue on your home line.
Can I use a local SIM and a travel eSIM together?
Yes, on a phone with a SIM tray. Google says Pixel phones can use one physical SIM and one eSIM, and Apple says models with a SIM tray can do the same.
Why will my eSIM not install on a borrowed phone?
Check that the phone is unlocked first. Apple says the iPhone must be unlocked to use an eSIM from a local or worldwide provider.
Sources
- Use eSIM while travelling internationally with your iPhone, Apple Support, accessed 23 October 2026
- Apple eSIM guidance for iPhone, Apple Support, accessed 23 October 2026
- How to use dual SIMs on your Google Pixel phone, Google Pixel Help, accessed 23 October 2026
- Thailand eSIM plans, eSIMzee catalog, accessed 23 October 2026
