Received my Ultra yesterday and could not get the Sim Card to transfer over so I had to make a trip to Sprint/Tmobile this morning.
Heads up, I got my Sim replaced with a Tmobile one back in September.
Today they said they couldn't figure out why the sim would not transfer so they gave me a new one they claim they just received and is the most updated in regards to the new 5G network.
On my way home I begin picking up the ‘5G UC’ signal for the 1st time.
I recommend going in to make sure you have the most up to date SIM.
Side Note: there was a lady in her late 60's being helped next to me. She wanted to upgrade to the S22. The rep was unable to process the order because he claimed the phone has not released yet (2/25) and then tried to recommend her to the Galaxy A71 or one of those recent variants talking about the phone is basically the same as the S22. I wanted to speak up and tell her to walk away and call telesales so bad but like me she would have to still come back to the store anyway to activate the sim. She was also a Sprint/Tmobile customer smh