Chunghwa Telecom (CLP), the largest carrier in Taiwan, has launched HD voice service on its 3G-based network, according to a recent news report.
Around 500,000 subscribers today can get HD voice service with 21 compatible (i.e. AMR-WB using) devices including the Apple iPhone 5, Sony, Nokia, and HTC handsets. Both subscribers need to be on CLP’s network with compatible devices (as is typical). The carrier expects by 2016 that more than 70 percent of devices (on its network? Google Translate makes it hard to say) will support HD voice.
Chunghwa Telecom has over 10 million mobile subscribers, according to Wikipedia.