Here is a simplistic mobile phone from Singapore, the iNO CP09, designed for kids and elderly. The phone comes with large buttons and a backlight display with big fonts for easy reading.
iNO CP09 has built-in FM tuner and 3.5mm audio jack. It includes a SOS emergency button on its back. The phone is available in Singapore for SG$78 or you may be able to get one in Taiwan also.