Pixel 6 Pro doesnt work on 5G UC

Well supposedly their rolling out some tests doing voice over 5G but I'm not sure what areas. As of now from what I've researched voice is over 4G which I also found out when I locked my phone into NR bands only. Could not send or receive talk or text. That's my recent experience. If anyone know the true facts on this please chime in. I'm still trying to learn a lot about these technologies since T-Mobile can't figure out why with 4+ bars of 5GUC all day long I have dial up data speeds even with map coverage not missing a single pixel of Magenta. Typical is 0.5mbps fed by - 100 to - 120dbm which is ridiculous even with 2-3 bars. It's not going to get better either with the blackouts of 3G and all the Sprint port overs plus ship jumpers from the other carriers not realizing they made a mistake. They need to stop messing around and provide better signals for those on the outskirts of the big cities because it's still a huge customer base for them. They are losing sight of customer first and if they're not careful people will leave in waves from here also.