Hampton Bays, NY
i have seen this option on my galaxy note 2 not enabled, so i enabled it but this feature is activation dependent on whether the radio tower has it as well.
currently, T-Mobile is using "Hedge" to simulate "4G" until LTE is deployed which is almost as good as LTE itself.
the LTE radio in the galaxy note 2 cannot be "turned on" even by the LTE engineering/LTE test menu until the SIM card has been updated by T-Mobile.
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The T-Mobile Galaxy S III firmware doesn't even allow access to the menu which allows the end user to select a particular voice codec. It's actually showing up as the codec selected by the phone for a call in the ServiceMode menu (accessible by entering *#0011#). This means that it is network-enabled.
Remember, this implementation of HD Voice does not require LTE, just UMTS. It also aligns with their strategy of being the "un-carrier," implementing features that other US-based carriers refuse to.