I just switched from AT&T to T-Mobile. I had used a 5G network previously on my AT&T plan, but I switched it back to 4G LTE because AT&T wanted too much. T-Mobile offers 5G on all their plans. I have the Galaxy A52 5G (and my wife's phone is the Galaxy A51 5G; same situation applies). After switching services, both phones were only connected only to 4G LTE. The people at T-Mobile looked for the Connections > Mobile Networks > Network Mode setting and did not find it on either phone.
I believe this has to do with the AT&T software (when I boot the phone, it's still displaying the AT&T logo). Short of doing a factory reset (which is no guarantee to fix this problem), I'm at a loss on how to correct this problem. The sales person at T-Mobile thought the only way to to get a new phone (of course!).
