The T28 was the lightest and slimmest mobile phone at the time, with a weight of only 83 grams.
[1] Like many mobile phones of the time (1999) it had a fixed, stubby external antenna.
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.'
A special version, the T28sc was released in China with support for reading and entering Chinese characters.