This morning I flashed my G~Note i717 to Padawan 7. I noticed I could make calls and text, but all of my cellular data would not work. After a quick google, I assumed that I needed to reflash a modem, so I downloaded a UCLF6 modem and flashed it in CWM. My data still did not work, so I reverted to a stock android 4.0.4 ROM. Now, not even my SIM card is recognized. Cannot call, text, or data (wifi is still functional). It isn't an issue with the SIM, as it works in my iPhone 3GS, and my friend said it worked in his Galaxy SIII (LTE included).
PS: I've tried finding similar topics. Most of it was people on T-mobile trying to get their service to work on an AT&T phone. Still, I tried their fixes and no luck.