Top Singaporean cellular provider SingTel plans to release the iPhone in that country for approximately S$690 ($500) starting in September, claims Channel NewsAsia, though Apple is unlikely to share in SingTel’s subscription revenues. With an estimated 10,000 iPhones already imported by residents, retailers note that the technology-obsessed country’s demand for the iPhone has dampened slightly since its mid-2007 U.S. launch, but interest…