Hector Ruiz, president of Motorola Inc’s Semiconductor Products Sector is cost sensitive at the moment, as he steers the group through a major restructuring exercise. So when a public relations executive told journalists and analysts at yesterday’s joint press conference with Lucent Technologies Inc in San Francisco to please turn off their cell phones and pagers so as not to interrupt the events, he appeared to be in two minds about the wisdom of the remark. Cell phones and pagers are really the sound of money, he said. รก