What Is an eSIM and How Does It Work?
An eSIM is a built-in digital SIM that lets you activate a mobile data plan instantly via QR code — no physical SIM card needed.
An eSIM (embedded SIM) is a digital SIM built into your phone that lets you activate a mobile data plan without inserting a physical card. You download a data plan, scan a QR code, and connect to local networks within minutes — making it the fastest way to get online when travelling abroad.
Unlike traditional SIM cards that you buy at airport kiosks or mobile shops, an eSIM is already inside your device. It is a small chip soldered onto your phone's motherboard during manufacturing. What changes is not the hardware but the software profile loaded onto it.
How Does an eSIM Work?
The technology behind eSIM is straightforward. Your phone contains a reprogrammable chip that can store carrier profiles. When you purchase a data plan from a provider like SimForMe, you receive a QR code. Scanning that code downloads a carrier profile to your eSIM chip, which tells your phone which network to connect to and what data allowance you have.
QR Code Activation
The activation process takes under five minutes:
- Purchase a plan — choose a data plan for your destination
- Receive a QR code — delivered instantly to your email
- Scan the code — go to your phone's eSIM settings and scan
- Connect — your phone registers on the local network
You can set up your eSIM before you even leave home, so you have connectivity the moment you land.
Multiple Profiles
Most modern phones can store several eSIM profiles simultaneously. This means you can keep your home carrier's profile for calls and texts while using a travel eSIM for data. On dual-SIM devices, both profiles can be active at the same time — your regular number stays reachable while you browse on affordable local data.
eSIM vs Physical SIM: Key Differences
| Feature | eSIM | Physical SIM |
|---|---|---|
| Activation | Instant (QR code) | Visit a shop or wait for delivery |
| Switching plans | Software toggle | Physically swap cards |
| Storage | Multiple profiles on one chip | One card per slot |
| Risk of loss | None — built into device | Can be lost or damaged |
| Availability | Growing rapidly | Universal |
The practical advantage for travellers is speed and convenience. No queuing at airport SIM counters, no fiddling with tiny card trays, and no risk of losing your home SIM while abroad.
Why Travellers Are Switching to eSIM
Traditional roaming charges from European carriers can add up quickly. A day of casual browsing in Turkey or Japan might cost €10–15 in roaming fees. Travel eSIM plans, by comparison, offer dedicated local data starting from around €3–5, depending on the destination and data allowance.
Beyond cost, there are practical benefits:
- Pre-trip setup — activate before departure and arrive connected
- No contract — buy only the data you need for your trip duration
- Dual SIM convenience — keep your home number active alongside the travel plan
- Instant top-up — running low on data? Purchase additional data without visiting a shop
For frequent travellers between destinations like Spain, Turkey, or Japan, eSIM eliminates the hassle of buying a new SIM at every destination.
Which Phones Support eSIM?
Most phones released since 2020 include eSIM support. Here is a quick reference:
Apple: iPhone XS and later (all models from 2018 onwards), iPad Pro (3rd gen+), iPad Air (3rd gen+)
Samsung: Galaxy S20 and later, Galaxy Z Flip/Fold series, Galaxy A54 and later
Google: Pixel 3 and later
Others: Huawei P40+, Motorola Razr, Oppo Find X3+, Xiaomi 13+
If you are unsure, check your phone's settings: go to Settings → Mobile Data → Add eSIM (iPhone) or Settings → Connections → SIM Manager (Android). If the option appears, your phone supports eSIM.
How to Get Started
Getting your first travel eSIM is a simple process:
- Verify compatibility — check that your phone supports eSIM and is carrier-unlocked
- Choose your destination — browse plans for countries like Thailand or the USA
- Select a data plan — pick the data amount and duration that matches your trip
- Complete purchase — receive your QR code via email
- Install the eSIM — scan the QR code in your phone's settings
- Activate at destination — enable the eSIM profile when you arrive (or set it to activate automatically)
The entire process from purchase to installation takes about five minutes.
Frequently Asked Questions
Can I use eSIM and a physical SIM at the same time?
Yes. Most modern smartphones are dual-SIM devices, meaning they support one physical SIM and one or more eSIM profiles simultaneously. You can use your physical SIM for calls and your eSIM for data abroad.
Do all phones support eSIM?
No. eSIM support depends on the device model and manufacturer. Most flagship and mid-range phones released after 2020 support eSIM. Check your phone's settings for an "Add eSIM" or "SIM Manager" option.
Is eSIM free?
The eSIM chip itself comes built into supported phones at no extra cost. You pay only for the data plan you choose. There are no activation fees when purchasing through providers like SimForMe.
How many eSIM profiles can I store?
This varies by device. iPhones can typically store 8–10 eSIM profiles, while Android devices vary. You can only have a limited number active at once (usually one or two), but stored profiles can be switched on and off as needed.
What happens to my eSIM if I reset my phone?
A factory reset deletes all eSIM profiles from your device. Before resetting, note down your plan details so you can contact your provider for a replacement QR code if needed. Some providers allow you to re-download the profile.
Considering the switch? See our eSIM vs physical SIM comparison to help you decide.