Restriction code for Nokia 1680 Classic

Hello,
I just bought this fone for my son, Nokia 1680 Classic, I charged it up n he bought it ova to me n it said "enter restriction code?" but i have np idea wat it is or whereto find it! Ive entered 0000 n 123456 000000 n none of these work, can u help pleeeese?? Thanx in advance

Sounds like the phone has been locked by the network you got it from, if your son is using a sim from another network this is the message that would show. You need to call the provider the phone is originally from and ask then for the network unlocking code, this is a number specific to your device.
I hope this helps