Established in 1994 , Butik Dukomsel started stretching his business by selling mobile phones networked AMPS . After that widen its expansion by providing a choice of GSM mobile phones after the digital cellular system was introduced in 1995. Now , after 20 years of existence , Butik Dukomsel increasingly sharpened nails by selling other products such as notebooks , cameras , smartphones , to the product of the legendary Japanese watches , Casio