The MobiSolution GPH-S300 weighs only 11.5 grams, but it packs a ton of well-designed features.  The device works with any 3.5mm headset, allowing you to use your own headphones for making calls or listening to music.  And, if you don’t want to lug around a separate audio player, the GPH-S300 act as a music player with microSD storage.

Interestingly, the GPH-S300 charges through its 3.5mm jack – a great feature that helps to keep the device tiny…just don’t hope to use the headset and charge it at the same time.  To that end, the device offers 6 hours of talk time and 8 days of standby.

MobiSolution is at CES this weekend, so be sure to check them out of you’re in town.