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As of 2004 smartphones are an increasingly large part of the mobile phone market. In a couple years, it is likely that most phones sold will be considered "smart", except for disposable phones.

Most common operating systems are Symbian (developed by a group including Nokia), Windows CE (developed by Microsoft), BREW (technically a platform, developed by Qualcomm), Linux and Palm OS.

Smartphones in the US tend to be PDAs with phone capabilities while those in Japan tend to be phones with PDA capabilities. Features tend to include Internet access, email access, scheduling software, built-in camera, contact management, and occasionally the ability to read business documents in a variety of formats such as PDF and Microsoft Office. In the CTIA conference held in Atlanta, Georgia in March 2004, incorporation of television into the smartphone was among the topics discussed.

Opera's "Small-Screen Rendering" is a special way to reformat webpages to fit inside the small screen width, hence eliminating the need for horizontal scrolling.

List of smartphones
BenQ P30
Kyocera 6035
Motorola MPX-200 (Motorola/Microsoft venture)
Motorola E680
Motorola A760 -The first phone to use Linux.
Motorola NEXTEL i930
Nokia 3650
Nokia 3660
Nokia 6600
Nokia 7610
Nokia 7650
Nokia N-Gage
Orange SPV
Orange E200
Samsung SGH-D700
Sendo X
Siemens SX1
Sony Ericsson P800
Sony Ericsson P900
Handspring Treo 600

Series 60 is currently amongst the leading smartphone platform in the world. It is licensed by some of the foremost mobile phone manufacturers in the world including Siemens, Samsung, Panasonic, Sendo and Nokia.

The Series 60 Platform is a multivendor standard for smartphones that supports application development in Java™ MIDP, C++, and browsing environments.

These are a few common features in Series 60:

Devices display resolution is 176 x 208.
It supports Java (J2ME/MIDP 1.0) + applications and Symbian C++ applications.
It is designed to be easy and fast to use.
It provides versatile and powerful application framework.
Currently (as of 2003) there are three Series 60 versions in the market which contains following devices:

Series 60 - Version 0.9

Nokia 7650 also known as Calypso (Production closed down)
Series 60 - Version 1.x

Nokia 3650
Nokia 3660
Nokia N-Gage
Samsung SGH-D700
Sendo X
Siemens SX1
Series 60 - Version 2.x

Version 2.0 utilizes new features like J2ME/MIDP 2.0 support and 16bit colors.
Nokia 6600 also known as Calimero
Nokia 6620
Nokia 7610 also known as Catalina

There are multiple user interface flavours that use the Symbian OS, such as UIQ and Nokia's Series 60. The adaptability of the user interface enables the use of Symbian OS on various form-factors of hand-held devices: clam-shell or tablet, keyboard and/or pen, PDA or mobile phone, and others.

The current Symbian OS is derived from the EPOC32 operating system, which was used on Psion Series 5 PDAs and originally developed by Psion Software. The Symbian OS has since gone though several versions.

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Devices that have used the Symbian OS
Nokia 9210 Communicator phone/PDA (2001)
Sony Ericsson P800 (2002)
Nokia Series 60 (2002)
Nokia Series 60 is used on various phones, first one being Nokia 7650. It is also used on other manufacturers' phones, such as Siemens SX1 and Sendo X.
Sony Ericsson P900 (2003)