3G update using Nubia stock firmware.
I can get 3G on T-Mobile with 3.86Mbps download. I can get H and H+ on ATT but my signal is weak here for ATT and I only get 1.86Mbps.
I can get Verizon voice but no data at all but I plan to try a 3G SIM tomorrow my sim is locked on LTE.
Using Cyanogenmod I can only get 2G. There is something wrong with the build and how it accesses the radios. I see the stock ROM flashes the radio during the install script. It reports "writing radio image" This leads me to believe there may be future flexibility in this dual radio beyond what is documented. The cyanogenmod does not flash the radio but is unable to use it in the same manner as the stock rom.
In the stock ROM it tells me I can use only one band per card.
SIM1-LTE 3g/4g, sim2-GSM only
Sim 1 LTE SIM2 no LTE
I assume it can be flashed to support other combinations but right now it gets 3G but only with one radio. If I put in 2 radios set to GSM/WCDMA 3G it flakes out and reverts to 2G.
Using the stock rom if you set card one to CDMA/EVDO/GSM/WCDMA and put in a T-Mobile or ATT SIM it gets H+,H,3G and it automatically eliminates the card 2 upon reboot if the slot is empty. Cyanoget does not ever disable the unused sim slot.
It appears the Cyanogenmod is having issues with this new complex dual radio configuration.
Tomorrow I plan to load in the Android L to see if it fixes this complex radio issue.