I have an old PAYG Nokia. I replaced my old SIM card with my new SIM card and it has come up with "Enter Restriction Code". Instructions say I should phone 789 to ask for unlock code but I can't phone because it says, "Enter Restriction Code" and won't let me dial 789
Usually when “Enter Restriction Code” normally appears if you use a card of other network providers other than the original carrier of your phone. This means that you need to unlock your phone to be able to use it using other sim cards.
thanks for letting us know about that, I need to know which model Nokia you have, so could you please go onto this link and match your phone to the one on the pictures? Let me know which one you have please.