I have tried to unlock my phone using calcs but none of the codes used worked. The phone is a black Nokia 1600 IMEI: 359377007589749 Operator: Optimus Hope someone can help me out with this one!
I turned the phone off, removed the SIM card and then inserted the code which I recognised as one I'd already tried. I get a message saying 'Not Valid' and when I try and use a different network SIM I'm told it's not a valid one.