Hi @Hyewon, welcome to our Community, I'm happy to help! Can you specify exactly what error message you are seeing? Are you trying to activate the new sim through the app? Can you delete the app and then download it again? It will then immediately have the latest software. Can you also check if the software of your device is up to date? This is important so that the app can work optimally. Can you try it through a browser/desktop version to see if it works then?
If it doesn't work, I can possibly activate the new sim card for you. I'd love to hear from you!
Hi @Hyewon, welcome to our Community, I'm happy to help! Can you specify exactly what error message you are seeing? Are you trying to activate the new sim through the app? Can you delete the app and then download it again? It will then immediately have the latest software. Can you also check if the software of your device is up to date? This is important so that the app can work optimally. Can you try it through a browser/desktop version to see if it works then?
If it doesn't work, I can possibly activate the new sim card for you. I'd love to hear from you!
Hi Pharwin,
Thank you for your swift reply.
It works now!
Thank you
Hyewon
@Hyewon Nice that it works now! If there's anything else I can do for you, just let me know. For now I wish you a really great day! 
