Anyone able to do dual VoLTE when Tmo is not data sim and Verizon is?

[chromedome00]

I have Tmo and Verizon sim in the non-TMO GM1917 . I want to use Verizon SIM for Data. When i do this, Tmo drops to UMTS for calls. If I leave Tmo as data sim, both lines do VoLTE.

I don't really want to randomly mess with different dialer settings under *#*#4636#*#* - anyone have any luck with both Verizon And Tmo as dual sim doing VoLTE on both lines while keeping Verizon for data?

If not, do we think that Android 10 will make a difference?

 

[chromedome00]

Another reason I want VoLTE on the Tmo SIM is that is what controls VoWifi - no VoLTE, no option for VoWifi.