Hi! My note 3 was given to me by a family friend and when I put my sim card in and try to make a call, it says "Not registered on network". I know this issue has popped up before but it doesn't seem to be resolved for many. For my case, I tried "Region Lock Away" to unlock the device but it still does not work.
I am rooted of course, but my question is, how can I solve this issue? Would flashing a custom rom solve this problem?