eSIM QR Codes: How They Actually Work

An eSIM QR code is not the eSIM. It is a set of installation instructions: the address of the carrier's provisioning server plus an activation key, wrapped in a square your camera can read. Scan it and your phone contacts that server, downloads the actual profile, and writes it to the chip inside. Understanding that one fact explains every QR code problem there is, including why most codes only work once and what to do when yours is lost.

What is actually inside the square

Decode any eSIM QR code and you find a short string starting with LPA, followed by a server address and an activation code. LPA stands for Local Profile Assistant, the bit of your phone's software that does the downloading. That string is the whole payload. This is why a QR code can arrive by email, sit on a web page, or be typed in by hand: it is just text, and every phone offers a manual entry option that accepts the same server address and activation code the square encodes. If a camera ever refuses to focus on a crumpled printout, manual entry is the reliable back door, and we show both routes in our setup guide.

Why most codes work exactly once

When your phone redeems the activation code, the provisioning server marks it used and hands over the profile. From that moment the code is a spent ticket. Scan it again, on the same phone or any other, and the server declines. This is a security feature, not stinginess: a reusable code would let anyone who saw your email install your plan.

The practical consequence is the one that fills support inboxes: deleting an installed travel eSIM does not free the code for a second use. The profile and its remaining data die with the deletion. So never delete an active plan expecting to re-scan later, and if you are changing phones mid-trip, read our transfer guide before touching anything.

Where to find your QR code, and where it should live

With us, the code appears on screen the moment your order completes, lands in your email within a minute, and stays permanently in your account dashboard. That third copy is the one that matters. Airport WiFi and a buried email is a bad combination, and hunting a QR code at a baggage carousel is the top way a smooth landing turns stressful. The dashboard version is always there, on any device, logged in from anywhere.

Better still, make the code irrelevant: install the eSIM at home on WiFi before you fly. The plan does not start burning days until it connects to a network abroad on arrival, so an early install costs nothing and turns your landing into switching on a toggle. Every question in this paragraph disappears when the install happens on your sofa.

Scanning it right the first time

The method matters less than people think, but the details save retries. On iPhone: Settings, Cellular, Add eSIM, Use QR Code, and point the camera at the code, on paper or on another screen. On Android: Settings, Network and Internet, SIMs, Add eSIM. The code needs to be on a different surface than the phone scanning it, which is the one genuine gotcha: you cannot scan a code displayed on the same phone that needs it. If the code is on your only phone's screen, use manual entry instead, copy the activation details from the email or dashboard and paste them in. Screenshot tricks and second devices work too, manual entry is just faster than borrowing a laptop to display a square.

Lost the QR code entirely?

Two situations, two answers. If the eSIM was never installed, log into wherever you bought it. Any provider worth your money keeps purchased codes available, ours sit in the dashboard next to the order. If there is no dashboard and the email is truly gone, support can reissue the code, since the activation key is tied to your order, not to the pixels of the original square.

If the eSIM was already installed, you do not need the code at all. The profile is on the phone, the code is a spent ticket, and re-scanning would do nothing. The only version of lost that costs anything is deleting the installed profile and losing the code, which stacks two mistakes, and even then support can sometimes rebuild the plan from the order. Ask before assuming.

Can someone steal your plan from the QR code?

Before installation, yes in principle: the code is a bearer ticket, first phone to redeem it wins. Treat an unused code like a concert ticket, do not post it, and be wary of anyone asking you to send a photo of it. After installation the code is worthless to a thief, the server already served it. This is also why buying eSIM codes from resellers on marketplaces is a gamble, a code that looks unused can be redeemed the minute after you pay. Buy from the provider, get the code fresh, and the whole risk category evaporates. More on the wider security picture in our guide to whether eSIMs are safe.

Quick answers

How do I get my eSIM QR code?

From the provider that sold the plan: on the order confirmation screen, in the confirmation email, and in your account with them. With MegaEsim all three exist and the account copy never expires.

Can I scan the same eSIM QR code twice?

Almost never. The activation code inside is redeemed on first install and declined afterwards, on any phone. A code that must be reused is a support request, not a re-scan.

Can I install an eSIM without the QR code?

Yes. Every phone's Add eSIM flow includes manual entry, where you type or paste the same server address and activation code the QR square encodes. Same result, no camera involved.

What does an eSIM QR code contain?

A text string: the LPA prefix, the provisioning server address, and a one time activation key. No personal data, no payment details, just the instructions your phone needs to fetch the real profile. How the whole system fits together is in our how it works guide.

Can I generate my own eSIM QR code?

No, and this is a common mix up. An eSIM QR code is not something you create in a generator, it is issued by whoever sold you the plan and is tied to one real profile on their system. If you bought from MegaEsim, your code arrives by email straight after checkout and also sits in your account under My eSIMs, ready to scan.