mobile

So lately I have been testing Roms from sprint,Verizon and international snapdragon Roms for the note 4.They all work great only issue I have is I cannot use the radio/data it just has a DIsabled icon on the top .When I try to put a manual APN it says please insert Sim card.Is this a kernel issue,modem issue or boot loader issue not matching the ROM ?I would like to know as there are some pretty sweet Roms out there .Anybody know ?