Palm recently announced the Treo 680 which is similar to the other Treo models but aimed at lower end customers.

The Treo 680 does not have a visible antenna like the other Treo models, instead it has it internally, which makes the 680 sleek looking.

US carriers are Cingular and T-Mobile since the Treo 680 is a GSM device. Another thing to note is that the 680 uses EDGE and not EvDo like the other Treo models.