I've tried installing Voice+ and disabling, no luck. I've tried setting the correct SMSC over 4G-LTE, but it still refuses and then I'm forced to set it to CDMA only. I'm on Verizon if it isn't obvious.
ROMs I've tried:
Cyanogenmod 11 (latest snapshot)
Paranoid Android (July 30th)
NuSense Six (HTC-based, only one that works)