And now for something really thin! The XpressMusic 5310 replaces the pleasantly portly Nokia XpressMusic 5300 slider music phone on T-Mobile. The phone weighs only 2.48 ounces and is 0.39 inches thin. It's a slick looking phone with good features despite a low $49 price tag on T-Mobile. It runs Nokia's S40 software, has a very capable music player that's compatible with MP3, WMA and iTunes unprotected AAC files. It has Bluetooth with A2DP stereo, and a microSD expansion slot that's SHDC compatible. T-Mobile and Nokia include a 1 gig card in the box along with a good quality stereo headset.