The palmOne Treo is a line of smartphones acquired and subsequently developed from Handspring (makers of the Handspring Visor). The Treos are unique, combining a color Palm OS PDA with a regular sized mobile phone. They have a number of integrated features making it possible to check the calendar while talking on the phone, dial directly from contacts list, send emails, and on recent models take pictures.

As of December 2004, there have been ten Treo models, listed below in order of introduction.

• Treo 180 (Tri-band GSM, flip form factor, black and white screen)
• Treo 180g (Tri-band GSM, flip form factor, Graffiti input instead of keyboard, black and white screen)
• Treo 270 (Tri-band GSM, flip form factor, color screen, backlit keyboard)
• Treo 300 (Sprint branded CDMA unit, flip form factor, color screen, backlit keyboard)
• Treo 600 GSM (Tri-band GSM, candy bar form factor, color screen, five-way navigator, backlit keyboard, camera)
• Treo 600 CDMA (Sprint and Verizon branded, candy bar form factor, color screen, five-way navigator, backlit keyboard, camera)
• Treo 600 CDMA No Camera (Sprint and Verizon branded, candy bar form factor, color screen, five-way navigator, backlit keyboard)
• Treo 650 GSM (High resolution screen, removeable battery, OS 5 )
• Treo 650 CDMA (High resolution screen, removeable battery, OS 5 )
• Treo 650 CDMA No Camera (High resolution screen, removeable battery, OS 5 )

External links

• The definitive resource and community for the Treo
• Treonauts.com is the World's 1st Bloguide dedicated to your Treo