December! I don't think so. January my friend! Or Feb at a push.
AS long as they don't do a reset (which it appears they may do) it will be fine.
If its season 1 all over again, i'll scream. And I hope Jack dies.
Anyway, back to the issue.
Id say something has damaged its hardware, it cant read the sim, or read it correctly anyway.
Id say time for new phone.
"That's it then. Cancel the kitchen scraps for lepers and orphans, no more merciful beheadings... and call off Christmas."