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# [For iOS] QR Code Is Not Working on My Voucher


1. eSIM cannot be added

If you see a message stating 'eSIM cannot be added' on your device during the eSIM installation, it might be due to network issues or because the installation has already been completed. This is a frequent problem encountered on iOS devices when using a QR code or manual setup.
![](https://www.superalink.com/_next/image?url=%2Fassets%2Ftroubleshooting%2Fios%2Fesim-cannot-added.png&w=640&q=95)

Let’s see these checklist to identify the eSIM was already installed or not:

* Ensure you can see the second network on top screen of your device that mean eSIM was installed (1).
    
* Open general settings and choose “About”, then you can see the ICCID was appeared or not in physical SIM section (2).
![](https://www.superalink.com/_next/image?url=%2Fassets%2Ftroubleshooting%2Fios%2Fcheck-iccid.png&w=828&q=95)

💡 How to solve:

* Check if there are any software need to update and install the latest version.
    
* Maintain a stable and strong signal Wi-Fi connection.
    
* Try to restart your device to fix any hidden misconfiguration automatically.
    
* Try to turn OFF the mobile data for a couple minutes and then back to turn it ON.
2. Unable to continue cellular configuration or activate eSIM

If you see a message stating 'Unable to Continue Cellular Configuration' or 'Unable to Activate eSIM' on your device during the eSIM installation, it might be due to a weak network signal.

![](https://www.superalink.com/_next/image?url=%2Fassets%2Ftroubleshooting%2Funable-continue-config.png&w=640&q=95)

💡 How to solve:

* Ensure you connected with stable and stronger connection before installation (required).
    
* Please try to install by again by manual installation. You can read the full guide [here](https://www.superalink.com/guide?section=manual-installation).

3. Unsupported eSIM

Seeing the “eSIM not supported” message on your device, it can be indicate that your device is locked to a specific carrier. Please request for refund 
![](https://www.superalink.com/_next/image?url=%2Fassets%2Ftroubleshooting%2Funsupported-esim.png&w=640&q=95)

If the checklist above doesn’t make any changes, please contact our customer support.