I have a classic Nokia phone which I have not used since ages.
I need to get some help of my classic friend as my new android phone has some issues.
But I ended up forgetting the security code which I have set for my classic friend.
After some good amount of search, I ended up with this link:
So, Yes it helped :)
Ensure sim is removed.
Switch off the phone.
Call key(Green one) + Asterisk key (*) + Number Three (3)
+ "Start the phone by pressning start button".
It reset the security code to 12345...voila Now I can use my phone :)) J
You need to get help from another hand to press all these 4 keys I suppose :)