7.How to use the aptX HD/LDAC?

The high-quality Bluetooth encoding format needs the support of the transmitter first(such as mobile phone), and then you need to correctly select the corresponding encoding format (some mobile phones can set the Bluetooth encoding format in the developer options, but different mobile phone's settings are different, please consult the mobile phone Vendor's customer service for more information)

iPhone devices are limited within AAC and SBC formats so that the Bluetooth codecs could not be switched. Normally it is defaulted as AAC, and SBC in phone calls.