Engadget has found an interesting accessory from a Chinese company called Yosion that turns your iPod Touch into the phone it has always wanted to be.

Powered by an Infineon baseband chip, this adapter not only offers voice calling and text messaging (presumably requiring a jailbroken iPod Touch for the apps; GPRS not possible yet), but it also doubles up as an 800mAh battery and provides 4.5 hours of call time or 120 hours of standby juice.

It’s unknown whether or not it will ever be available stateside, but it could potentially allow users to buy cheaper cell plans without a two year contract or carrier lock-in. Hit the source for a video of it in action.

Update: I dug around a little, and found the Yosion forums, which have a bit of chatter about the accessory if you’re looking for more info. (Google translate is a must-have, unless you speak Chinese.)

[Engadget]