The Treo 270 was a dual-band

GSM The Global System for Mobile Communications (GSM) is a family of standards to describe the protocols for second-generation (2G) digital cellular networks, as used by mobile devices such as mobile phones and Mobile broadband modem, mobile broadba ...

flip form factor

smartphone A smartphone is a mobile phone with advanced computing capabilities. It typically has a touchscreen interface, allowing users to access a wide range of applications and services, such as web browsing, email, and social media, as well as multi ...

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, an acrobatic transition fr ...

. 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) is a discontinued 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. ...

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 cdmaOne, most often simply referred to as CDMA, is a 2G digital cellular technology. It was the commercial name for Interim Standard 95 (IS-95), a technology that was developed by Qualcomm and later adopted as a standard by the Telecommunica ...

instead of GSM and being provider-locked.

References

Handspring mobile phones {{electronics-stub