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Esfos, an acronym for Esten Phone Operating System, is a mobile operating system developed by Esten, the system was released in 2001 and ended its development in 2013. The last version was based on the Android kernel.

2001-2004

Esfos 2001

2004-2013

Esfos

The last cell phone to use Esfos was Esten Elite 3 in 2013, which is later integrated to Esten Complex 8, ending its development.

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