I apologize for the long-winded question, but there are a lot of details I think will help so here goes.
I bought a used, fully-unlocked Samsung Galaxy S9+. It’s able to be used with any carrier. I wanted to try TracFone out as a carrier, so I installed a Tracfone SIM card compatible with Verizon to set up the phone. After installing the SIM card, I had to call Tracfone to help me choose the correct network and SIM settings. That worked as normally, but after I did the setup and reboot, my phone automatically installed several Verizon apps, and now boots up with a Verizon screen. When I made a phone call it said Verizon. I wanted to try Mint, so I switched and am now setup with the default APN settings, which work fine. However, I wonder why my phone still says Verizon. I can’t even uninstall those apps. Those apps weren’t even there until after I installed the SIM card from TracFone earlier.
So right now, I have a fully unlocked phone, that behaves as a Verizon phone, that uses Mint as the carrier, which pulls from T-Mobile’s network (haha). I just want to undo all the Verizon stuff, and then hopefully I can remove the apps and allow for a firmware update. I am currently running Android 8. When I tried to update to Android 9 while still on Tracfone, it would keep saying it was up to date, even though my brother’s S8 was running Android 9 (and he uses Tracfone). Now when I check after switching to Mint it says “Sorry, we are having trouble authenticating your device. Try again later.”
How do I undo the Verizon “settings” to make my phone behave more like an unlocked phone again, and allow for updates?