Anyway, I went to Settings > More... > Mobile networks > Access Point Names to add a new APN for Straight Talk service. Usually there's a couple default APNs already there, but my list was blank so I didn't have to delete anything. I then went to Menu > New APN, added the info, and finally hit Menu > Save. However, nothing was added to the list so I can't select an APN afterward. I tried multiple times but the list always stays empty. I tried reflashing the ROM but that didn't make any difference either.
AOKP is the only ROM I'm experiencing this on. I went back and flashed SHOStock2 and could add a new APN without any problems. Whenever I flash a new ROM, I always do...Reset data, Wipe cache, Wipe dalvik cache, and Format /system first.
If anyone has any suggestions, it would be much appreciated. Thanks!