Hello there. I was able to downgrade my Pixel 3a to Android 9 with the Google rom flasher and install UBports, but I'm having an issue with it recognizing my sim card. I am on Sprint, but recently was given a T-Mobile upgrade sim card since Sprint is merging with T-Mobile. After I was able to activate that sim card on my Android phone (Samsung A71 5G), I decided to put the already activated sim card in my Pixel 3a running UbPorts. The issue is that when I go to carrier settings and select either T-Mobile or Sprint, it says denied. Is my new sim card compatible or does it not work? When I use it on my A71 5G phone it shows T-Mobile on top, but on my Pixel 3A, it does not. Is there a way to get this sim card to work or something I can reset in the terminal?

Thanks for your time.

@grhmhome

Sorry for bumping the thread (again), but I solved my issue. Since my old account was Sprint, it wasn't going to work out of the box, but I switched to T-Mobile and it now works properly.