 Where previous cell phone voice codecs only supported frequencies up to 3.5 kHz and upcoming wideband audio services branded as "HD Voice" up to 7 kHz, Full-HD Voice supports the entire bandwidth range from 20 Hz to 20 kHz.For end-to-end Full-HD Voice calls to succeed however, both the caller and recipient's handsets as well as networks have to support the feature.The GSMA has nominated the EVS codec for superwideband via VoLTE.