I made a phone call the other day on my friend's Lumia 920, calling another Lumia 920, both on the T-Mobile USA network. The clarity of my other friend's voice on the phone call was quite impressive.
I could buy a 920 of my own from T-Mobile, but alternatively, I'm also considering whether a Lumia 1020 would be worth having. Unfortunately, T-Mobile itself does not sell 1020s. I would have to buy one from another retailer and use it on the T-Mobile network.
The HD Voice question is a critical factor in deciding whether to buy a 1020. Would HD Voice would work on the unlocked 1020?