IPhone XR Cell Compatibility

I'm thinking about paying full price and buying the iPhone XR 128gb RED from Apple for use on Sprint. After activating on Sprint I may switch carriers down the road to either Verizon or TMobile. I know in the past, sometimes the iPhones had network differences for CDMA/GSM. Are there different iPhone XR models or will my iPhone XR be able to be used on any major US carrier?