The Ericsson T28 is a GSM dual-band, compact flip mobile phone manufactured by Swedish telecoms company Ericsson Mobile Communications in 1999.
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 characters.
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.
