I just got a new sim card thru at&t. It's for 5g in my new iphone13. My system is not updating and showing 5g. What do I need to do to update?
[Re-Titled by Moderator]
You may not be in a 5G area right now. I'm on AT&T and only parts of my city are 5G areas. Also check Settings>Cellular>Cellular Data Options>check to see what you have set for Voice & Data and Data Mode. Also, try restarting your iPhone.