(FORTUNE Magazine) – Motorola started a global trend toward skinniness with its Razr and Slvr fashion phones. Now Samsung is trying to dip into the skinny business itself with the ultra-slim t509. Only 9.8 millimeters thick, or less than four-tenths of an inch--a couple of silly millimeters thinner than Motorola's Slvr--the bar-style t509 won't cause any unsightly bulges in your tight jeans pocket when it arrives Stateside in May. The t509 is an EDGE phone, which offers data rates of more than 100 kilobits per second over GSM phone networks. Samsung had not announced at presstime which carrier would sell the phone or how much it would cost, but Cingular and T-Mobile are the two leading GSM carriers in the U.S. The t509 lacks a hefty feature list, but it does squeeze in Bluetooth, a VGA camera, and the ability to play MP3 ringtones. There's no room for an expansion card slot, alas, so while it may resemble an iPod Nano in shape, it's a no-no as a music phone.