I have had a few phones (Nokia and Samsung) that once unlocked have said "invalid sim" I have found that if you put in original sim and change network select from manual to Automatic that has sorted it for me.
All you do then is replace old sim with new one.

If this helps then fine if not then dont moan.......

Nick

Flash White Full Flash And Un Lock Again

or use calcularor to generate nokia unlock code

I think may not work