The Treo 270 was a dual-band

GSM The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such ...

flip form factor

smartphone A smartphone is a portable computer device that combines mobile telephone and computing functions into one unit. They are distinguished from feature phones by their stronger hardware capabilities and extensive mobile operating systems, whic ...

made by

Handspring Handspring may refer to: *Handspring (company), a company that made personal digital assistants *Handspring (gymnastics), a gymnastics move involving forward or backward rotation of the body *Rising handspring or nip-up A nip-up is an acrobatic ...

. Released on May 31, 2002 for $499 with service contract, $699 without service contract,Handspring's Treo tries color (video) - CNET News
https://web.archive.org/web/20110617074305/http://news.cnet.com/1606-2_3-31061.html (Archived copy)] it was the fourth device in the Palm Treo, Treo family. It featured a full keyboard and shipped with

Palm OS Palm OS (also known as Garnet OS) was a mobile operating system initially developed by Palm, Inc., for personal digital assistants (PDAs) in 1996. Palm OS was designed for ease of use with a touchscreen-based graphical user interface. It is pro ...

version 3.5.2H. The 270 had a 160×160 color screen, 16 MB of internal memory and a 33 MHz DragonBall CPU. During its development, the Treo 270 was codenamed "Atlanta".Handspring Treo 270 - ZDNET UK
https://web.archive.org/web/20111001130931/http://www.zdnet.co.uk/reviews/smartphones/2002/05/16/handspring-treo-270-10000592/ (Archived Copy)] The Treo 300 was a twin model marketed by Sprint Corporation, Sprint identical to the 270 except for using

cdmaOne Interim Standard 95 (IS-95) was the first ever CDMA-based digital cellular technology. It was developed by Qualcomm and later adopted as a standard by the Telecommunications Industry Association in TIA/EIA/IS-95 release published in 1995. Th ...

instead of GSM and being provider-locked.

References

Handspring mobile phones {{electronics-stub