No network issue Galaxy S24+ AT&T

[Cpaige]

This started 24 hours ago and I can't find a fix anywhere. AT&T is useless. Please help. I got the S24+ just over a month ago. Last night I put it on airplane mode for about 5 minutes tops. When I turned it off I had no network connection. Like at all. It was almost like I had no sim card. I'll attach pictures of what it's showing. The only way I could do anything was if I was connected to wifi. Went to AT&T today and they gave me a new sim card... put phone on airplane mode again, and it's doing the same thing. Is there an easy fix or do I need to go to a service center? 

[jeremyNK]

What was the problem?

[Cpaige]

Haven't figured out exactly yet. Gonna try to go to at&t tomorrow. I put my phone in airplane mode, took it off, and it said my phone wasn't registered to a network. Went to at&t got a new sim and it worked fine. Put it in airplane mode again, and same thing happened. So I tried putting sim into my old iPhone XR and it works fine there but on my s24+ it says my phone isn't registered to a network. Can't text, can't call, can't do anything.

[jeremyNK]

Is it a samsung default setting

[jeremyNK]

Try restarting your network settings

[Cpaige]

Did that. Nothing

[Ivnmac]

The reason is that samsung got rid of "network mode" in the update. So if you don't have strong 5g in your area.. your out of luck.