I see two very interesting settings. They opted with IPv4/IPv6 versus just IPv4 like on Note 2, and also APN type has hipri added which previously wasn't the case.Thanks for the headphone feedback - will definitely look at Klipsch as the recommendations suggest. HTC provided it to test to a small group. I was lucky enough to be included in this group.
APN settings (entries not listed are Not Set). There are 2 separate - one for data and one for mms:
T-Mobile Data:
APN: fast.t-mobile.com
MMS Protocol: WAP 2.0
MCC: 310
MNC: 260
APN type: default,supl,admin,hipri
APM protocol: IPv4/IPv6
APN enabled/disabled: APN enabled
T-mobile MMS:
APN: fast.t-mobile.com
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc (dont' know if this is cut off or all of it)
MMS Protocol: WAP 2.0
MCC: 310
MNC: 260
APN type: mms
APM protocol: IPv4/IPv6
APN enabled/disabled: APN enabled
Have you tried testing HD Voice by calling someone else on T-Mobile network with S3, One S, iPhone 5 or One? HTC One should be supporting AMR-WB.
Also, do you know which stores in NYC will have it next wednesday?