Roameo

eSIM 101

What is an eSIM? A 2026 traveller's guide

An eSIM is a SIM card built into your phone that you activate by scanning a QR code, with no plastic card to insert or swap. A travel eSIM adds a data plan for the country you are visiting while your home SIM stays active for calls and texts on your usual number.

The short version: an eSIM is a digital SIM card that gets you online abroad without swapping anything. The long version is below — bookmarked TOC included.

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Definition

What is an eSIM?

An eSIM (embedded SIM) is a programmable SIM profile that lives inside your phone's hardware. Instead of inserting a tiny plastic card, you download a carrier profile over the internet and your phone connects to that network like it always has.

For travellers, this changes everything: you can buy data for Tokyo from your sofa in London, install it the night before, and connect the instant your plane lands. No airport kiosk markups, no fishing for an ejector pin at 1am.

Instant delivery

QR code arrives the moment you pay. No shipping, no kiosk queue.

140+ countries

One app, one account, coverage across every continent travellers visit.

Refundable

Doesn't connect on landing? We refund within 24 hours, no support marathon.

Keep your home number

Your physical SIM stays active for calls and texts back home.

Mechanics

How does an eSIM work?

Every modern smartphone ships with an eUICC chip — a tiny piece of silicon designed to host downloadable SIM profiles. When you scan a Roameo QR code, your phone fetches the profile from our provisioning server and writes it to that chip.

From the network's perspective, an eSIM profile looks identical to a physical SIM. It has the same IMSI, the same authentication keys, the same connection behaviour — which means roaming, hotspot, and VoLTE all work exactly as you'd expect.

What's different is provisioning. Instead of a factory cutting a plastic SIM and a courier delivering it, the profile is generated on demand and signed over the air. That's why your eSIM arrives in seconds instead of days, and why we can issue, suspend, and refund it remotely.

Comparison

eSIM vs physical SIM

Where each option lands on the six things travellers actually care about.

Feature
eSIM
Physical SIM
Installation
Scan a QR — done in 60 seconds.
Order, ship, swap, eject tool required.
Travel friendly
Install on the plane, connect on landing.
Buy on arrival, often at airport markups.
Multiple plans
Store several eSIM profiles, switch in Settings.
One card, one plan, one country at a time.
Carrier switching
Add a new carrier without changing hardware.
New SIM means a physical swap.
Security
Can't be physically stolen or cloned the way SIMs can.
SIM swap fraud and theft remain real risks.
Refund policy
Roameo refunds if the eSIM fails to connect.
Once opened, almost never refundable.

Honest take

Pros and cons

Roameo sells eSIMs and still thinks you should hear both sides.

✓ Pros

  • Activate before you board the plane
  • Keep your home SIM running side-by-side
  • Switch destinations without buying a new chip
  • Nothing to lose, snap, or wash in a laundry
  • Multiple plans on a single device

✗ Cons

  • Not supported on phones older than ~2018
  • Moving to a new phone needs a re-issue, not a swap
  • Requires an internet connection to install
  • Some prepaid local carriers are eSIM-only / SIM-only
  • Carrier locking can still apply on older devices

iPhone

How to install on iPhone

Works on iPhone XS (2018) and newer.

  1. 1

    Open Settings → Cellular → Add eSIM.

  2. 2

    Tap Use QR Code, then scan the QR Roameo emails you.

  3. 3

    Label the line (e.g. Roameo Japan) and pick Primary / Secondary.

  4. 4

    Toggle Data Roaming ON for the Roameo line — keep Primary for calls.

Android

How to install on Android

Works on most flagships from 2020 onward. Menu wording varies by manufacturer.

  1. 1

    Open Settings → Network & Internet → SIMs → Add eSIM.

  2. 2

    Scan the QR Roameo sent (or pick Enter manually).

  3. 3

    Wait ~30 seconds for the profile to download.

  4. 4

    Set the new line as Mobile Data and enable Data Roaming.

FAQ

Six questions before you buy

Do I need Wi-Fi to install my eSIM?
You need a working internet connection (Wi-Fi or your home cellular data) to download the eSIM profile. Once installed, the eSIM activates over the local network on landing.
Will my home number stop working?
No. Your physical SIM remains active — calls and SMS continue on your home number while Roameo handles travel data.
Can I use one Roameo eSIM on two phones?
No — eSIM profiles are bound to a single device after activation. If you change phones, contact support for a re-issue.
How long do Roameo eSIMs last?
Validity is per plan (most are 7, 15, or 30 days). The clock starts when the eSIM first connects to a network, not at purchase.
Does eSIM work for tethering / hotspot?
Yes on most plans. Hotspot uses your plan's data allowance like any other usage.
What if my phone is carrier-locked?
Roameo eSIMs require an unlocked phone. Most modern devices sold outright are unlocked; subsidised carrier handsets may not be.
Ready when you are

Pick a destination — connect on landing

140+ countries, refundable if it doesn't connect.

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