The Palm Treo 1 is a line of smartphones originally developed by Handspring, which was bought by Palm, Inc. They are now manufactured and maintained by Palm, Inc. Treos have a number of integrated features such as the ability to check the calendar while talking on the phone, dial directly from a list of contacts, and send email messages. Recent models include a built-in camera. Traditionally, Treos run Palm OS which allows synchronization with both Mac OS X and Microsoft Windows, but newer models also have editions that run Windows Mobile.

Treo Devices

Officially announced models:

{| class="wikitable" ! Release date !! Models !! PDA Notes !! Phone Notes !! Other Notes !! Network |- | 2008 || Palm Treo Pro (GSM) || TFT touch screen display with a 320 x 320 pixel resolution, Windows Mobile 6.1 Professional Edition OS, preloaded with Microsoft Office Mobile Professional 6.1, 2.0 MP camera/camcorder, 256 MB user memory/128 MB program memory (expandable via microSDHC slot up to a supported memory of 32 GB ), stereo Bluetooth 2.0+EDR compliant, one touch Wi-Fi access (802.11b/g), integrated GPS, 3.5mm headphone jack. || GSM bands: 850/900/1800/1900, GPRS, EDGE, UMTS UMTS bands: 850/1900/2100, HSDPA.
Released August 19, 2008.|| First Palm Treo device to have a flush touchscreen, 3.5mm headphone jack (as opposed to historically using a 2.5mm jack), and the new "glossy" black (Obsidian) styling. Approximately 1/3" thinner than previous generation Treos. || US: Unlocked / No Carrier as of launch date.

Australia: Telstra Europe: Telefonica O2 and Vodafone Group. |- | 2008 || Palm Treo 800w (CDMA) || TFT touch screen display of 16k colors with a 320 x 320 pixel resolution, Windows Mobile 6.1 OS, preloaded with Microsoft Office Mobile Professional 6.1, 2.0 MP camera/camcorder, 256 MB user memory/128 MB program memory (expandable via microSD slot up to a supported memory of 8 GB ), stereo Bluetooth 2.0+EDR compliant, one touch Wi-Fi access, integrated GPS. || CDMA 800/1900 MHz dual-band digital voice network access, EV-DO Rev A (backwards compatible with EV-DO Rev 0 and 1XRTT). Sprint Nextel is the exclusive North American wireless carrier of the Palm Treo 800w at launch date (July 13, 2008).|| First Palm Treo device to support the A2DP Bluetooth Profile, integrated GPS and have embedded Wi-Fi. Product SKU PTR800HK. || Sprint |- | 2007 || Palm Centro (CDMA), (GSM) | 320 x 320 pixel resolution, removable battery, 1.3 MP camera, bluetooth 1.2, Palm OS 5 || CDMA 800/1900MHz digital dual-band, CDMA2000 EvDO network, backwards compatible with 1xRTT networks. Sprint exclusive at launch date. Released October 14, 2007. For AT&T, GSM bands: 850/900/1800/1900, GPRS, EDGE|| Product SKU PTR690HK aligns this phone with the Treo family, however it was branded the Palm Centro.|| AT&T/Sprint/Verizon Australia: Telstra |- | 2007 || Treo 500 (GSM) | 320 x 240 pixel resolution, no touchscreen, removable battery, 2 MP VGA camera, bluetooth 1.2, Windows Mobile 6.0 || GSM, GPRS, EDGE, UMTS -class 10 radio Quad band (850/900/1800/1900 MHz) || Launched September 12, 2007 for European network.|| Vodafone |- | 2007 || Treo 755p (CDMA) | 320 x 320 pixel resolution, removable battery, 1.3 MP camera (subject to change), Bluetooth, Palm OS 5 || CDMA 800/1900MHz digital dual-band, CDMA2000 EvDO network, backwards compatible with 1xRTT networks. First CDMA Treo to lose aerial antenna. Released May 2007. || || Sprint/Verizon |- | 2006 || Treo 750v and 750 (GSM) | 240 x 240 pixel resolution, removable battery, 1.3 MP camera, Bluetooth 1.2, Windows Mobile || GSM GSM bands: 850/900/1800/1900, GPRS, EDGE, UMTS UMTS bands: 850/1900/2100, HSDPA (via unsupported software patch) || || AT&T Australia: Telstra |- | 2006 || Treo 680 (GSM) | 320 x 320 pixel resolution, removable battery, 0.3 MP VGA camera, bluetooth 1.2, Palm OS 5 || GSM, GPRS, EDGE-class 10 radio Quad band (850/900/1800/1900 MHz) || First Treo phone to have the stubby antenna appendage removed. || AT&T/Rogers Australia: Telstra |- | 2006 || Treo 700wx (CDMA) | 240 x 240 pixel resolution screen, 64MB RAMFact: date=February 2007 Bluetooth 1.2 wireless support, removable battery, 1.3 MP camera, Windows Mobile || 800/1900MHz digital dual-band Palm® Treo™ 700wx smartphone for Verizon Wireless CDMA2000 EvDO network—compatible with 1xRTT network || || Alltel/Sprint/Verizon |- | 2006 || Treo 700p (CDMA) | 320 x 320 pixel resolution screen, Bluetooth 1.2 wireless support, removable battery, 1.3 MP camera, Palm OS 5 || CDMA 800/1900MHz digital dual-band, CDMA2000 EvDO network-backwards compatible with 1xRTT and IS95 networks || || Sprint/Verizon |- | 2006 || Treo 700w (CDMA) | 240 x 240 pixel resolution screen, originally 32MB RAM, updated to 64MBFact: date=February 2007, Bluetooth 1.2 wireless support, removable battery, 1.3 MP camera, Windows Mobile || CDMA2000 EvDO network— backwards compatible with 1xRTT network || || Sprint/Verizon |- | 2004 || Treo 650 (CDMA) | 320 x 320 pixel resolution screen, Bluetooth 1.1 wireless support, removable battery, 0.3 MP camera, Palm OS 5 || CDMA model: 800/1900 MHz digital dual-band || |- | 2004 || Treo 650 (GSM) | 320 x 320 resolution screen, Bluetooth 1.1 wireless support, removable battery, 0.3 MP camera, Palm OS 5 || GSM, GPRS, EDGE-class 10 radio Quad band (850/900/1800/1900 MHz) || || Australia: Telstra |- | 2003 || Treo 600 (CDMA) | Color screen, five-way navigator, backlit keyboard, Palm OS 5, no camera || || candy bar form factor || Sprint/Verizon |- | 2003 || Treo 600 (CDMA) | Color screen, five-way navigator, backlit keyboard, Palm OS 5, camera || || Candy bar form factor || Sprint/Verizon |- | 2003 || Treo 600 (GSM) | Color screen, five-way navigator, backlit keyboard, Palm OS 5, camera || Quad-band GSM || candy bar form factor || Australia: Telstra |- | 2003 || Treo 300 | Color screen, backlit keyboard || || flip form factor || Sprint |- | 2002 || Treo 270 | Color screen, backlit keyboard || Dual-band GSM || flip form factor |- | 2002 || Treo 180g | Monochrome screen, Graffiti input instead of keyboard || Dual-band GSM || flip form factor |- | 2002 ||Treo 180 | Monochrome screen || Dual-band GSM || flip form factor |- | 2002 || Treo 90 | Only a PDA, runs Palm OS 4.1H, 160x160 12-bit CSTN colour display, internal battery || no phone component is built-in || |-