Is my Galaxy A50 phased out? Trying to change from 3G
I bought a renewed Samsung Galaxy A50 (SM-A505U1) online last week and put my AT&T plan SIM card into it. A few hours ago, I got a text message from an AT&T number 7535 that the "[AT&T] network is being upgraded, and the cell phone [I] tried to activate will no longer work". I called the 611 number and was then told "the phone was phased out and you have to get a 5G phone to use the SIM". I'm really bummed and confused because I had looked in these forums and read it was supposed to be fine. According to an April 12, 2022 att.com list of phones, namely the Samsung "Galaxy A50 (A505U1, A505A, S506DL)" were phones "tested and approved for the AT&T network". I updated the A50 to the March 1st security patch and went to Settings -> Connections -> Mobile networks, but it still only shows an "Allow 2G Service" button. How do I update this phone to allow 4G/LTE? Is it because of my SIM card?