From my experience, It doesn't matter. I am running the MD4 Firmware/radio/baseband on stock/rooted. I have 4G access, MMS, SMS, all the fun happy stuff. If fact I would say that my network quality has improved, I get about 3-4 bars inside my house - where as before on stock i was rocking 1-2. Also no choppiness with voice calls that I was experiencing with the MB1 Radio.
I would also like an actual explanation as to why this works, what the OP said makes sense...that i need my carriers radio to get on their network. But from my results that doesn't matter.
I was able to flash CM 10.1 but 4g wasn't working. MMS and everything else worked fine, just no 4g. I tried messing around a little bit to get 4g to work, but I had no success. So I decided to flash back to touchwhiz for now, but I really hope someone can get 4g fixed.
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