The Sony Ericsson Z500a, released in December 2004,
[Sony Ericsson & Cingular Offer Z500a Mobile Phone]
''Wireless News'', December 17, 2004. was released through
Cingular Wireless
AT&T Mobility LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the t ...
and
Dobson Cellular
Dobson Cellular Systems, Inc. now part of AT&T Mobility, was a wireless telecommunications provider in several regions of the United States, including Alaska, Arizona, California, Kansas, Kentucky, Maryland, Michigan, Minnesota, Missouri, New Yor ...
.
Sony Ericsson Z500
phonescoop.com; accessed on line February 22, 2008. The phone has push-to-talk
Push-to-talk (PTT), also known as press-to-transmit, is a method of having conversations or talking on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode.
H ...
walkie-talkie
A walkie-talkie, more formally known as a handheld transceiver (HT), is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald Hings, radio engineer Alfred J. Gross, ...
functionality, but the handset was released before Cingular had rolled out their Push to Talk service.[Sony Ericsson Z500a: full review]
Sascha Segan, ''PC Magazine'', online, January 24, 2005. Accessed on line November 30, 2007.
This is a camera phone that has motion capture that can send short videos through the Multimedia Messaging System. It operates on 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 ...
850/1800/1900.
References
Z500a
Mobile phones introduced in 2004
{{Sony Ericsson phones