People just do not talk on the phone as much anymore. I can go a month using no more than five minutes of voice airtime.
Regardless, we have been told that it is too expensive/complicated to include band 41 TD-LTE and SVLTE because of the multiple RF paths involved. We disagree with that simplistic assessment, but so far, it has proven accurate. If that changes in the long run, we will let you know.
In the meantime, if you must have SVLTE, then you have numerous strong options: HTC One, Samsung Galaxy S4, Motorola X, etc.
AJ