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The Nokia Talkman 510 is a brick phone which has been discontinued. The phone is also known by the name 'Dataman'.
The term 'brick' has become popular for explaining phones of a solid, chunky form factor that more closely resembles a brick than a device, something that has become more defined with the evolution of the mobile phone. Such phones have also come to be colloquially known as 'dumbphones', a play on the term 'smartphone'.