The Palm Treo is Palm's smartphone line. The two most popular models are the Palm Treo 680 and the Palm Treo 750. The Palm Treo phones are the very popular with business users and are often compared to Research In Motion's Blackberry line.
In America, AT&T has the Treo line that they sell with phone plans, however it is possible to purchase Treos that are unlocked and can be used on other networks as well. The Treo line uses Windows Mobile operating system and has all the business functions that most people use, like messaging, email support, QWERTY keyboards, and expansion slots. They have support for popular business software as well.