[Q] n9005 x3 same problem in all brand new note 3

i had three note threes in last month all with same problem
unlocked phones. where the signal bars are when it loses signal
a round circle with a line threw it show on the signal bars area. now
when it finds signal again it will show up signal bars but when you
try and call or txt. it says. NOT REGISTERED ON NETWORK.
now these are brand new phones out of sealed boxs and three phones
in a row in past month hav had same issue.

i hav another note coming on wednesday now if the same is with this
fone what do i do. whats the problem.

i hav tryed many diff sims. tryed the sims in my iphone right nxt to note and
they work perfectly. tryed rebootin fones and messing with network settings
and nothin does it. this is beyond crazy whats happenin here
i had a note 2 last yr and it worked flawlessly with signal so any ideas.
3 fones same issue now 4th one comin this wk. ???