The Ericsson T28s is a

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 ...

dual-band In telecommunications, a multi-band device (including (2) dual-band, (3) tri-band, (4) quad-band and (5) penta-band devices) is a communication device (especially a mobile phone) that supports multiple radio frequency bands. All devices which ha ...

, compact flip

mobile phone A mobile phone, cellular phone, cell phone, cellphone, handphone, hand phone or pocket phone, sometimes shortened to simply mobile, cell, or just phone, is a portable telephone that can make and receive calls over a radio frequency link whi ...

manufactured by Swedish telecoms company

Ericsson Mobile Communications Ericsson Mobile Communications AB was a subsidiary of Ericsson, entirely focused on development of mobile phones (handsets). The major offices were located in Lund, Kumla, Raleigh, North Carolina and Lynchburg, Virginia. History Under the command ...

in 1999.

Description

The T28 was the lightest and slimmest mobile phone at the time, with a weight of only 83 grams.Ericsson T28 Manual
/ref> Like many mobile phones of the time (1999) it had a fixed, stubby external antenna. It was probably best known as the first phone that used

lithium polymer batteries A lithium polymer battery, or more correctly lithium-ion polymer battery (abbreviated as LiPo, LIP, Li-poly, lithium-poly and others), is a rechargeable battery of lithium-ion technology using a polymer electrolyte instead of a liquid electro ...

. At one point, it was the best selling mobile phone in America. In terms of market positioning, Ericsson designated this as a premium phone, as such it was priced substantially higher (often more than triple) the price of the T10 and T18 devices - their nearest cosmetic and functional competitors. It has a tiny LCD screen and a spring-loaded latch mechanism to release the 'flip.'

Models

Four different versions of the T28 were sold. T28z was compatible with GSM1900 for use in North America. T28s was compatible with GSM900/1800 for use in the rest of the world - this is by far the most common version. T28 World was compatible with GSM900/1900 for use worldwide on GSM900 and North America on GSM1900 (this was the second World phone Ericsson introduced, the first being the I888 which had the distinction of being the first commercially available GSM900/1900 phone). A special version, the T28sc was released in China with support for reading and entering

Chinese character Chinese characters () are logograms developed for the writing of Chinese. In addition, they have been adapted to write other East Asian languages, and remain a key component of the Japanese writing system where they are known as ''kanj ...

s. The device came in three colours—very dark blue, lighter blue and sand. The sand version being the least common. The device was listed as compatible with two batteries. A normal slim-line and an ultra-slim lower capacity battery. However the device was also battery-compatible with the later R320 and R520 series.

References

External links

T28 Knowledge Base

{{Sony Ericsson phones T28 T28 Mobile phones introduced in 1999