A:Answer Hi:
All I can say is that I've been a Sprint customer for probably 20 years. Have spent time in Oklahoma and now in the Denver area. No problems with Sprint coverage. Have traveled around the country and no problems.
As far as the S10 goes, I love the phone and it's my 4rd Samsung "S" series phone. S3, S5, S7 and now the S10.
I currently live in Parker, CO which is 20 miles SE of Denver and no problems with the S10 in and around the area.
As for the phone, it's great. Love the fact that it comes with a screen protector installed. Lot's of new features and still getting to play with it. I did get a Otterbox Commuter case. Have used the Otterbox Commuter cases for all my previous "S" phones. Good protection and not that bulky.
Hope this answered some of your concerns.