Dear All.
Does anyone see the HD+ icon when making VoLTE call on your phone?
Does it means using EVS codec?
Yes 
1-HD Voice (AMR-WB):
- Frequency range: 50 Hz to 7 kHz
- Codec: AMR-WB
2-HD+ Voice (EVS):
- Frequency range: Up to 20 kHz
- Codec: EVS
HD+ Voice call (EVS) offers better audio quality and clarity compared to HD Voice (AMR-WB).
On Samsung devices, yes!
Can you please give me the snapshot?
Who owns the logo? The “HD Voice” and “HD Voice +” Logos are owned by the GSM Association (“Licensor”). The HD and HD+ logos are designed for operators and device manufacturers to market and promote HD Voice capabilities on networks and products.
What is the purpose of the logo? Mobile network operators agreed that multiple logos will confuse end users. It would be far better for the industry to support the notion of one HD Voice logo Furthermore one logo, supported by the GSMA, has the potential to become a universally recognised symbol which easily identifies HD Voice enabled devices and services.
Why are GSMA specifying the Requirements for the HD Voice Logo and HD Voice +?
GSMA are specitying the necessary requirements to be met by network operators and/or device manufacturers to qualify for use of the Logos. GSMA are undertaking this to serve an urgent market need to enable standardised HD Voice and HD Voice + services to be brought to market across the whole industry.
It should be noted that it is not GSMA’s intention to override relevant ETSI or 3GPP specifications as they evolve, GSMA shall open and continue the dialogue with both organisations on this work, including 3GPP SA4 to ensure appropriate reference to existing and future standards specifications.
See Annex H
Annex H - ‘HD Voice+’ logo with LTE