1. spartanmike1's Avatar
    I have spent over an hour on the phone with T-Mobile and Samsung support and gotten nowhere so I will try with the knowledgeable people here.

    When connected to a 5G network, my new S21 Ultra will not make calls with HD+ sound quality. During a 5G network call, the HD+ icon is not present on the call screen and looking at the Service Mode (*#0011#) invariably shows that the sound codec is "AMR:NB" which is the narrow band relatively low quality call sound. However, if I go into mobile network settings and put the phone in 4G network mode and call on a 4G network then calls do have the usual T-Mobile HD+ sound and icon present and the Service Mode shows the sound codec as "EVS:SWB", all as expected for HD+ call sound quality.

    Any thoughts on what is going on with the missing HD+ call sound on 5G network? Does T-Mobile 5G, or any 5G, support HD+ call sound?
    02-01-2021 02:20 AM
  2. Gayle Lynn's Avatar
    Us a new SIM card needed? Did you rule that out?

    Just guessing while doing a little googling about 5G VoLTE.
    02-01-2021 03:47 AM
  3. mgbosshogg's Avatar
    Is 5G VoLTE a thing ?
    02-01-2021 05:06 AM
  4. shook187's Avatar
    I would make sure your old phone with the same Sim works before getting bent out of shape over it.
    02-01-2021 05:35 AM
  5. Gayle Lynn's Avatar
    3G, 4G, 4G LTE and 5G VoLTE are frequently used terms associated with smartphones, but what does it all mean?

    It is a service only provided over 4G and 5G LTE devices that are compatible to VoLTE.

    With VoLTE, voice is sent over “packet switching”; and call quality, volume, and data speed are improved considerably.
    ~ Dec 10, 2018

    https://gtb.net/why-gtb/blog/differe...t-it-all-means
    02-01-2021 06:29 AM
  6. PsychDoc's Avatar
    Is it possible they assume that any call made or received on a 5G network is already HD+? Thus, any such additional designation would be viewed as redundant?

    Just a thought.
    02-01-2021 07:28 AM

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