So on my T-Mobile Note 9 variant, I would usually see the "HD" symbol when on a phone call. With my unlocked 10+ on TMobile, I haven't seen that symbol once. I'm trying to compare the call quality to what I remember it being like on my Note 9, but to those who might know, is the lack of the HD symbol on the unlocked a sign it isn't HD? Or is it just a visual incorporated in the TMobile call interface that isn't on the unlocked model?