eSIM vs Local SIM: Which Suits Your Trip?
A local SIM is a physical SIM from a shop or counter in the country you're visiting. A travel eSIM is a data plan you install before you leave. Both get you local data. The real differences are when you get connected, whether you need a local number, and how long you're staying.
The core difference: timing
With a local SIM, you get connected after you've found a shop, queued, and swapped cards. That might be an airport counter on arrival, or a store in town the next day. Until then you're on airport Wi-Fi or your home carrier's roaming. In many countries buying a SIM also means showing your passport so it can be registered to you.
With a travel eSIM, you install it at home on Wi-Fi. When the plane lands, the phone connects and you have data before you reach passport control. The plan's validity starts at that first connection, not when you buy, so buying early costs nothing. That's the moment travellers most often need data: the ride-hail app, the hotel address, the message that you've landed.
Physical swap vs second line
A local SIM usually replaces your home SIM in the tray, unless your phone has two slots. That means keeping a tiny card safe for the whole trip, and your home number is off while it's out. Verification texts from your bank won't arrive.
An eSIM sits alongside your home SIM. Most phones can run both at once: the eSIM for data, the home line for calls and texts. eSIM vs physical SIM explains how the two kinds differ in general.
Phone numbers and calls
This is where a local SIM can win. Local SIMs usually come with a local number, which helps if you need to receive calls from local businesses, or if a service will only send codes to a local number.
Most of our plans are data-only. Calls and messages go through apps like WhatsApp, iMessage or Signal over the eSIM's data, and your home number keeps working for texts. A few US and UK plans include a local number with minutes and SMS, and the product page shows which. If you need a local number somewhere else, a local SIM is the better fit. Keeping your WhatsApp number abroad covers the app side.
Long stays
For a stay of several months, a local contract or monthly prepaid plan often makes sense. A common approach is to use an eSIM for the first weeks, while you find housing and sort out the paperwork, then switch once you have an address. For shorter trips the counter visit isn't worth it, especially if you're crossing borders: a regional eSIM such as Europe covers the whole route, while a local SIM covers one country.
Size it the same way either way
Whichever you choose, buy the right amount of data.
Our plan recommender uses three daily rates: 0.2 GB a day for maps and messaging, 0.5 GB for social media and photos, and 1.3 GB for streaming or hotspot use. It then adds 15% headroom so you don't run dry on the last day.
- Five days in Tokyo, maps and messages: 5 × 0.2 = 1 GB, about 1.2 GB with headroom.
- Two weeks in Thailand, socials and photos: 14 × 0.5 = 7 GB, about 8.1 GB with headroom.
- A month in Portugal working from cafés with hotspot: 30 × 1.3 = 39 GB, about 44.9 GB with headroom. That's unlimited territory, with the daily high-speed cap shown on the plan. Most plans allow sharing, but it depends on the local network, so check the plan details before you rely on hotspot.
See current plans and prices on Japan, Thailand or Portugal. Each destination guide, such as the Japan guide, shows the local networks.
Which should you choose?
- Choose an eSIM if you want data on landing, you're staying days or weeks, you're crossing borders, or you want to keep your home number active.
- Choose a local SIM if your phone can't take an eSIM or is carrier-locked, you need a local number outside the US and UK, or you're settling in for months.
Check your phone on the device list first. An eSIM needs an eSIM-capable phone that is carrier-unlocked.
Questions
Is a local SIM cheaper than a travel eSIM?
Sometimes, especially for long stays. For short trips, compare the live prices on our product pages with the time and trouble of buying on arrival.
Do I need my passport for a travel eSIM?
No. You pay with Apple Pay, Google Pay or a card, and install from a link or QR code.
Can I use a travel eSIM and a local SIM together?
Many phones can hold a physical SIM and an eSIM at once, but only so many lines can be active. Check your phone's dual-SIM settings.
Can I switch to a local SIM later in the trip?
Yes. Put the local SIM in the tray and choose which line carries mobile data in your phone's settings. The travel eSIM can stay installed, and you can delete it once you no longer need it.