Pinephone CE, modem issues.
After a boot, when set to 4G only, the buttons at the top will show 4G and full bars on the cellular bar, but by the time I'm able to open a texting app, both have gone away.
I'm using Sprint, with cinet.spcs as an APN and named "Sprint", and I've tried 4G only, 3G only, and 2G only.
I changed the actual name of the the APN to 1 (looking up sprint APN, I was able to find about 5 places that say to name it sprint, and 1 place that said to name it 1), and after that, was able to send and receive texts for about 3 minutes before I started getting a little red X next to the time sent part of the text message. These messages did not send. Shortly after, the modem icon died again at the top left. About a minute later, it came back flashing, then shortly went away again.