Pretty much all phones sold in the US do now. They're just firmware locked to each carrier sometimes. Samsung phones and Pixels for example work on all carriers and support all the bands. Sent from my Pixel 3 XL using Tapatalk
You might be right on the S9 holding on to band 41. I have two of them. One makes me upset, but the other one makes my wife upset and that is a bad situation. She gets upset and starts telling me how bad that phone is and why did I buy it. I would think that Sprint should be able to see a phone is struggling to upload anything and shift it to another band. The cell site should force the phone off band 41 when it is struggling, Something sure does smell bad with this and the stink is forcing people to look elsewhere.