Iv had this issue before and just removing the sim card and reinstalling it works. Not this time. Iv done a network reset and still does not see it. Now it does sit on the wireless charger from Samsung a lot and I thought I read that it can cause issues with Sim cards. There was an update a few days ago but this all started happening today. Iv not installed any new apps today either. I'm unsure if taking it to AT&T is going to do anything for me. Go to a repair shop first?
As a process of elimination can you try your sim card in another phone and then see what happens @Zentra5788 ?
And if possible try another sim in your phone.
I've alsys used wireless charging and as far as I'm aware this process of charging one's phone does not negatively impact the sim card.
Your Network shop can certainly check your physical sim card.
You could also run the diagnostic tool in your Samsung Members app.
As for having the phone assessed I'd recommend to use a Samsung Service Centre for this.
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "