Got new sim card a while back, did eveything as instructed.
Restarted the phone more then once, "Do not disturb" is not on as still receiving emails, whatsapp calls and messages. No unblocking code needed or asked as the device was previously unlocked from O2 last year.
Can make out going calls as well as sms messages in which they can receive.
Using Virgin Media App, it's saying "You need to insert your new SIM!" which it is.