I have had the same phone and sim card for a few years and it has stopped being recognized. I have a Samsung S21 Ultra. I have not had an issue until recently. I do not have access to SIM manager and the carrier information is not show up.
Great idea! The SIM Card worked in another phone. It is a phone issue. Which is odd, but it gives me something more specific to look into. Thank you @Chalupa_Batman
