That's symptomatic of something funny going on with your IMEI, baseband or /efs partition.
Last time I saw that was while purposely booting my T889V on the international N7100 (yes, the non-LTE one) kernel.
IIRC it's referred to as "Factory Test Mode"...
My phones: Galaxy Note II SGH-T889V (with LTE enabled
/ ext4 SD card support on TouchWiz ROMs
Previous phones: Nexus S GT-I9020A, Galaxy Gio GT-S5660M (Arpeggiomod ROM
/ Discussion, stock rooted ROM
Phones for which I play "tech support" for family and friends: Galaxy Nexus GT-I9250, Galaxy Q SGH-T589R, Galaxy 551 GT-I5510M, LG C-800G Eclypse
- Level 8