Im on Cricket wireless. I was worried about the same thing asked around with no answer so I took the leap of faith and here we are 100 flashes later still have my SMS calls and 3G I Do have to mess with some settings to get YouTube and mms working but it won't unflash your device the only time that has happened to me was when I Odin back to stock. That my friend will completely turn you stock.
Sent from my SPH-L900 using XDA Premium 4 mobile app
Sent from my Alieonic note2!!!