1. anon(5789612)'s Avatar
    I have an unlocked Z30 STA100-5 which is compatible with T-Mobile US network. Not sure as to why my Z30 doesn't have HD voice. I had a Z10 and Q10 previously through T-Mobile and both devices had HD voice. The Z30 is listed as a device that supports HD Voice - Adaptive Multi-Rate Wideband (AMR-WB) but it seems like my phone is not using it. Could it be my Z30 or T-Mobile itself? Should I call T-Mobile customer service and report the issue?
    Last edited by ohhmike; 07-15-14 at 06:02 PM.
    07-15-14 04:27 PM
  2. jaydee5799's Avatar
    You could start there and call them and ask about it.
    07-15-14 07:04 PM

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