You can add another piece to the Samsung Galaxy S3 puzzle: SamMobile has what it believes to be a service manual for the GT-i9300 handset, complete with design sketches and hardware specs. The images depict a form factor that resembles the "dummy" phone we've seen so much of lately, but omits the square rim in favor of rounded corners. There's plenty of cause for skepticism, however. In terms of specs, the supposed manual lists a quad-core 1.5GHz CPU, which deviates some from the 1.4GHz Exynos 4 processor the company unveiled less than 24 hours ago.