Ok, I had to respond to this thread. Most smartphones these days use through hole or SMT mounted headphone jacks. The design would simply have needed to include the routed trace from the IC lines in question to the jack pins on question. The only "cost" would have been in the CAD layout time. Once the design is done in the CAD the Gerber would be sent to the PCB manufacturer. Each layer is built by layering each PCB layer with metal, then it is etched, usually via lithographic plate and chemicals, to remove the unwanted metal leaving the traces behind. So there is NO additional materials cost involved. So either Nokia made a dumb design decision in the PCB layout (or a mistake) or someone didn't/doesn't want the drivers installed. In other words, it's BS.