What is an eSIM? A simple guide for travellers
Updated 21 October 2026 · 5 min read · by the Hopsim team
An eSIM is a digital SIM card built into your phone. Instead of inserting a plastic card, you scan a QR code and a mobile plan is downloaded in about two minutes. Travellers use an eSIM to get cheap local data abroad while keeping their own SIM and number active.
How does an eSIM work?
Every eSIM-capable phone has a small chip (the eUICC) that can store several mobile profiles. When you buy a travel eSIM, you receive a QR code. Scanning it downloads the profile of a local network partner to that chip. From then on your phone treats it like a second SIM card.
You can keep your normal SIM (physical or eSIM) for calls and texts, and use the travel eSIM for mobile data. You switch between them in your phone's settings.
eSIM vs physical SIM card
- No shop, no tiny tray, no SIM pin: you install it from home in two minutes.
- Delivered instantly by email, so you can buy it the night before you fly.
- Your own SIM stays in the phone: you keep your number for WhatsApp, banking codes and calls.
- You can store multiple eSIMs and switch per trip.
- It can't get lost or damaged.
Which phones support eSIM?
Most phones from 2019 onwards: iPhone XR, XS and newer (iPhone 14 and later in the US are eSIM-only), Samsung Galaxy S20 and newer, Galaxy Z Fold and Flip, Google Pixel 3 and newer, and many recent Motorola, OnePlus, Xiaomi and Oppo models. The phone also has to be carrier-unlocked.
Quickest check: dial *#06#. If an EID number appears, your phone supports eSIM.
Why use a travel eSIM?
- Much cheaper than roaming: a one-off price instead of daily roaming fees.
- Online the moment you land: no hunting for a SIM shop at the airport.
- Local networks: you connect to the same 4G/5G operators locals use.
- Hotspot allowed: share data with your laptop or travel companions.
Are there downsides?
A travel eSIM is usually data only, so you don't get a local phone number. For most travellers that's fine: WhatsApp, FaceTime and iMessage calls work over data, and your own SIM still receives SMS codes. If you need a local number for weeks, a local physical SIM can still make sense.
