So, to start, I have been running the 01/02 build of Bean Stalk 4.4.2 for a few weeks now with no issue. I'm also on the latest modem, VRUCML1, which I again have been running for a while with no issue.
Today I decided to try out some newer builds, so I made a nandroid and then flashed the new Carbon 4.4 build (01/19). This was when I had my first network issue, where it had me stuck in roaming even though I was in my home. So, thinking the ROM may still have some issues, I switched to a newer build of Bean Stalk (01/17). While I now had mobile data back, I found that my phone was unable to send SMS.
I finally restored my nandroid, yet now I find that this problem is still persisting. I flashed the previous modem, VRBMF1, and the problem still persists.
The weirdest thing, though, is that even though it won't send SMS, my mobile data works fine. I'm able to browse the web at full LTE speeds, but not send SMS.
Edit: After a recent test, it seems phone calls won't work either. So my phone seems to be handling the LTE functions well enough, but is having trouble with the CDMA/EVDO part of the antenna.
Anyone who has any advice, please help. Like I said, I'm inclined to do a SIM reset, but won't be able to until much later tonight.