I'm not receiving SMS. I can send SMS to non-iPhones and they receive them. I can also call and can receive iMessages fine.
Sprint BYOD service
Are you having any issues with MMS? Are you using the stock messaging app on the phone, or a 3rd party app? Have you been able to check your online account to ensure that there aren't any features blocked?
It's an iPhone XR, so there's only one SMS app - Apple's Messages. Again, I can send iMessages, SMS to Android people and they receive them, but I don't receive SMS texts (green, non-iMessage) at all.