I just killed all Sprint bands on my note 10 plus and immediately latched onto band 66 upon restart. Although the speed test initially spiked to around 11 Mbps it did quickly throttle back to about 5 Mbps.
Seems like the Pixel 4 XL LOVES to hold on to B41. Makes me wonder if the Pixel 2 XL actually supported HPUE.
It seems like the performance of the Pixel 4 XL > Pixel 2 XL.
Faster speeds, never falls to 3G, better radio performance overall!
##DATA# passcode 000000 go to LTE disable bands 25, 25, and 41 and restart your phone. You should come back to riding on T-Mobile's network. You'll have to re-enable all Sprint's LTE bands or just do a data profile update to get back on Sprint's network. I put my phone back on Sprint's network as T-Mobile still has the data speeds capped to 5Mbps here.