HEY~I'm not sure exactly what the issue is since I am not able to see the phone myself but I remember my friend had the same issue and he told me he used this link! Maybe it could help you out!!! https://vkrepair.com/what-does-invalid-sim-mean/
has other services been working? Ex. Outgoing incoming calls/text.If so it is possible your phone may not be compatible with the provider. I had this issue when I was in Korea. I was only able to get data but I was not able to make calls/texts.
