My Verizon Galaxy SIII is stuck on 3G, and will not access 4G. I am using Cyanogenmod 10.2.1 (stable).
The problem started when I was travelling, and used *228 to try and improve reception. I just meant to use option 2 to update the list of towers (Preferred Roaming list), but derped and pressed 1 instead. Option 2 just updates the list of towers, while option 1 also updates the location of my Home switch. No issues making receiving calls/texts etc, but stuck on 3G data speeds.
Once I returned home from my trip, I used *228 option 1 again to fix this, but it did not.