eSIM Activation Troubleshooting Guide: Fix Common Errors Step by Step

eSIM Not Working? Let's Fix It Together

eSIM technology makes connecting abroad easier than ever — no more fumbling with tiny SIM cards at airport kiosks. But sometimes things don't go as smoothly as expected. Whether you're seeing "Unable to add eSIM," your QR code won't scan, or your phone just won't connect to the local network, you're not alone. These are common issues with straightforward solutions.

This guide walks you through the most frequent eSIM activation problems and how to resolve them on both iPhone and Android devices. Follow along step by step, and you'll be connected in no time.

Problem 1: QR Code Won't Scan

After purchasing your eSIM, you'll receive a QR code via email. If your phone can't read it, here's what to check.

Common Causes

• Screen brightness is too low, or the QR code image is blurry
• Camera lens is dirty or obstructed
• You're trying to scan the QR code displayed on the same device (this doesn't work)
• No Wi-Fi connection during the scan attempt

How to Fix It

1. Display the QR code on a separate screen — open it on a computer monitor, tablet, or another phone, then scan it with your device.
2. Increase screen brightness to maximum and zoom into the QR code.
3. Clean your camera lens with a soft cloth.
4. Confirm you're connected to Wi-Fi before scanning.
5. Use manual entry instead — if the QR code still won't work, enter the SM-DP+ address and activation code manually. You'll find these details in your purchase confirmation email.

Problem 2: "Unable to Add eSIM" Error

You've scanned the QR code, but your phone says it can't add the eSIM. Here's why this happens and how to resolve it.

Common Causes

• Your device doesn't support eSIM
• The QR code has already been used (each QR code works only once)
• Your device has reached its eSIM storage limit
• Your phone is carrier-locked

How to Fix It

1. Verify eSIM support: On iPhone, go to Settings → Cellular and look for "Add eSIM." On Android, go to Settings → Connections → SIM Manager.
2. Check existing eSIMs: Review your installed cellular plans and remove any unused eSIMs to free up space.
3. Restart your device: A simple restart resolves more issues than you'd expect. Power off, wait 30 seconds, then power back on.
4. Check for carrier lock: See the carrier lock section below for detailed instructions.

Problem 3: Carrier Lock Issues

Some phones purchased through a carrier are locked to that carrier's network. This means you can't install an eSIM from a different provider until the lock is removed.

How to Check for Carrier Lock

iPhone

1. Go to Settings → General → About.
2. Scroll down to "Carrier Lock."
3. If it says "No SIM restrictions," your phone is unlocked and ready.

Android

1. Go to Settings → Connections → Networks.
2. Try inserting a SIM from a different carrier to see if it's recognized.
3. Alternatively, contact your carrier's customer service to confirm your unlock status.

Problem 4: "No Network Found" After Installation

Your eSIM is installed, but your phone shows no signal or says "No Service." This is usually a settings issue and is easy to fix.

Fix on iPhone (iOS)

1. Turn on Data Roaming: Settings → Cellular → select your eSIM → toggle Data Roaming on.
2. Set eSIM as primary data line: Settings → Cellular → Cellular Data → select your eSIM.
3. Make sure the eSIM line is active: Settings → Cellular → tap the eSIM plan → ensure "Turn On This Line" is enabled.
4. Enable automatic network selection: Settings → Cellular → tap eSIM → Network Selection → toggle Automatic on.

Fix on Android

1. Turn on Data Roaming: Settings → Connections → Mobile Networks → toggle Data Roaming on.
2. Set eSIM as mobile data SIM: Settings → Connections → SIM Manager → select eSIM for Mobile Data.
3. Check network mode: Settings → Connections → Mobile Networks → Network Mode → select LTE/3G/2G (auto connect).
4. Enable auto network selection: Settings → Connections → Mobile Networks → Network Operators → toggle Automatic on.

Configuring APN Settings

APN (Access Point Name) settings tell your phone how to connect to the mobile network. Most eSIMs configure this automatically, but if yours didn't, you may need to enter the settings manually.

On iPhone

1. Go to Settings → Cellular → select your eSIM → Cellular Data Network.
2. Enter the APN details provided in your purchase confirmation email.
3. Restart your device after entering the settings.

On Android

1. Go to Settings → Connections → Mobile Networks → Access Point Names.
2. Tap "+" or "Add" to create a new APN.
3. Enter the APN details from your confirmation email and save.
4. Select the new APN and restart your device.

Resetting Network Settings

If none of the above steps work, resetting your network settings can resolve stubborn connectivity issues. Note that this will erase all saved Wi-Fi passwords, Bluetooth pairings, and VPN configurations.

On iPhone

1. Go to Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings.
2. Enter your passcode to confirm.
3. After your device restarts, reconfigure your eSIM settings.

On Android

1. Go to Settings → General Management → Reset → Reset Network Settings.
2. Select the SIM to reset and confirm.
3. After restart, reconfigure your eSIM settings.

When to Install: Before Departure vs. After Arrival

One of the most common questions is when to install the eSIM. Our strong recommendation: install before you leave, activate after you arrive.

Recommended Steps

1. 1-2 days before departure: Install the eSIM while connected to your home Wi-Fi.
2. After installation: Confirm the eSIM plan appears in your cellular settings.
3. Before boarding: Enable Airplane Mode.
4. After landing: Disable Airplane Mode, turn on Data Roaming, and set the eSIM as your primary data line.

Managing Dual SIM Setup

With an eSIM, your phone operates in dual SIM mode — your physical SIM handles calls and texts with your regular number, while the eSIM handles mobile data abroad.

Recommended Dual SIM Configuration

• Default voice line: Your physical SIM (keeps your phone number active)
• Default data line: Your eSIM (uses the travel data plan)
• iMessage / FaceTime: Keep on your physical SIM number

Still Not Working? Contact Support

If you've tried everything above and your eSIM still isn't working, the eSIMzip support team is here to help. To speed up the process, please have the following information ready:

What to Prepare

• Your device model and OS version (e.g., iPhone 15, iOS 17.4)
• The eSIM product name and order number
• Screenshots of any error messages
• A list of troubleshooting steps you've already tried

Reach out through eSIMzip Support Center via live chat or email. You can also browse common questions on our FAQ page.

Frequently Asked Questions

Wrapping Up

Most eSIM activation issues come down to a few simple fixes: turning on Data Roaming, setting the correct default data line, and verifying APN settings. Keep these three things in mind, and you'll resolve the vast majority of problems on your own.

If you're still stuck, don't hesitate to contact eSIMzip Support — we're here to make sure your trip starts without connectivity headaches.

Haven't purchased your eSIM yet? Browse plans for your destination at the eSIMzip Store.