Symbian started long before mobile phones with Psion's EPOC. It was used in some very nice little PDAs that had very good keyboards (Psion Series 5), and later,

Symbian started long before mobile phones with Psion's EPOC. It was used in some very nice little PDAs that had very good keyboards (Psion Series 5), and later, competed against Microsoft's Windows CE, which also competed with the Palm PDAs. http://en.wikipedia.org/wiki/EPOC_%28operating_system%29 http://en.wikipedia.org/wiki/EPOC_%28operating_system%29