T-Mobile iPhone XR (bought from Apple) - Can I use it on Verizon network?
I know T-Mobile uses GSM. And Verizon uses CDMA. So can I bring a T-Mobile iPhone XR and use it on the Verizon network?
iPhone XR
The iPhone XR supports both.
https://www.apple.com/iphone-xr/specs/
In order to use it with Verizon, you will have to get an unlock code from T-Mobile. Only they can provide one.