Two ways to get local data abroad, and they suit different trips.
An eSIM is a digital plan you install before you fly and switch on when you land. A local SIM card is a physical card you buy after you arrive. The eSIM wins on speed and convenience and keeps your own number working; a local SIM is usually better only if you need a local phone number or your phone cannot take an eSIM.
Here is how the two compare in practice, and how to decide which one your trip actually needs.
eSIM vs local SIM card: the short version
| Travel eSIM | Local SIM card | |
|---|---|---|
| When you get it | Before you fly | After you land |
| Setup time | A few minutes, on Wi-Fi at home | Queue at the airport or a phone shop |
| Connected on arrival | Immediately | Once you find a shop and it opens |
| Keeps your home number | Yes, on your existing SIM | Only on a dual-SIM phone |
| Local phone number | No — data only | Yes |
| ID or passport registration | Not required | Required in many countries |
| Risk of losing it | Nothing physical to lose | Easy to lose the tiny card you removed |
| Needs an eSIM-capable phone | Yes | No |
Why most travellers now choose an eSIM
You land already connected
The single biggest practical difference. With an eSIM installed before departure, you switch the line on as the plane doors open and you have maps, messages and your ride-share app working before you reach the baggage carousel. With a local SIM, you are offline until you find a counter — which on a late-night arrival may mean waiting until morning.
You keep your own number
Most phones from the last few years run two SIMs at once. Your home SIM stays active for calls, texts and the two-factor codes your bank sends, while data runs over the eSIM. Swapping in a local SIM usually means taking your own SIM out, so anything sent to your normal number goes unanswered — a genuine problem if your bank texts a code before it will approve a payment abroad.
No paperwork
A number of countries require you to register a prepaid SIM against your passport before it will activate. That is why airport SIM counters ask for your documents and why the process takes longer than it looks. A travel eSIM sidesteps registration entirely.
Nothing to lose
The classic travel mishap is putting your home SIM somewhere safe and never seeing it again. An eSIM is a profile on the phone, so there is no card to misplace and no tray to open on a moving train.
When a local SIM card is still the better choice
We would rather point you to the right answer than the one that suits us. Buy a local SIM if:
- You need a local phone number. Some car rental desks, delivery apps, banks and tour operators will only send codes to a domestic number. Travel eSIMs are data-only, so they cannot receive those.
- Your phone does not support eSIM, or is carrier-locked. No travel eSIM will work on either. Check on our device compatibility page before you buy anything.
- You are staying for months. For a long stay or a working-holiday visa, a local postpaid or prepaid plan is usually cheaper per gigabyte and gives you a number locals can call.
- You want to make ordinary voice calls. Data-only means calls go through WhatsApp, FaceTime or Messenger. That is fine for family, less fine for phoning a restaurant.
What about just using roaming?
Roaming is the third option and the one most travellers default to, because it needs no decision at all. It is also usually the most expensive of the three, since New Zealand and Australian carriers charge a flat daily fee for every day you use your phone overseas. We compared the actual numbers in eSIM vs roaming for NZ and Australian travellers.
For a short transit stop, there is a fourth option worth knowing about: a one-day stopover eSIM, which is sized and priced for a layover rather than a holiday.
How to decide in one minute
- Does your phone support eSIM and is it unlocked? If not, a local SIM is your only option.
- Do you need a local phone number? If yes, buy a local SIM. If you only need data, an eSIM is simpler.
- How long are you staying? Up to about a month, an eSIM is easier and usually cheaper. Several months, price up a local plan.
- Do you need to be online the moment you land? If yes, install an eSIM before you fly.
Frequently asked questions
Is an eSIM better than a local SIM card?
For most short trips, yes. An eSIM is installed before you fly so you land connected, it needs no passport registration, and your home number keeps working alongside it. A local SIM is better if you need a local phone number or your phone cannot use an eSIM.
Do I need to remove my SIM card to use an eSIM?
No. Most phones from the last few years run two SIMs at once, so your physical SIM stays in place for calls and texts while the eSIM handles data. Set mobile data and data roaming to the eSIM only, so your home carrier cannot charge you.
Does a travel eSIM give me a local phone number?
No. Travel eSIMs are data-only, so there is no local number and no traditional calls or SMS. Apps like WhatsApp, FaceTime and Messenger work normally over data. If you need a domestic number, buy a local SIM card instead.
Do I need to register my passport to use an eSIM?
No. Several countries require passport registration before a local prepaid SIM will activate, which is why airport SIM counters ask for documents. A travel eSIM needs no identity registration and no SIM swap.
Can I use an eSIM if my phone is locked to a carrier?
No. A carrier-locked phone cannot use any travel eSIM, however new it is. Your carrier can unlock it, usually once any contract or instalment plan is paid off. Check your unlock status before you buy.
Try a travel eSIM on your next trip
Browse SIMNOVA eSIM plans for 200+ destinations — from NZ$2.95, delivered by email in seconds, and it does not start until you land.
Last updated: 16 September 2026.
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