Galaxy A50, 'US 5G Talk/t\Txt/ 50GB data' add-on did not work for within-US Talk/Calls

[grqmpakilt]

Apparently the A50 supports 4G, but, recently I was unable to make a crucial within-US call with the add-on (but was able to access the internet). After the crisis had passed and much googling, I deselected AT&T which for some reason the phone kept selecting by default and choose T-Mobile, the only network in the US that still supports 3G LTE. Only then was I able to Talk. 

My questions are:
1. Was this a VoLTE not available issue on my A50 or Public Mobile or something else problem?
2. Bottom line: Will I need a newer phone to make calls once 3G is phased out in the next year?

GK

[softech]

@grqmpakilt 

1. A50 has VoLTE but it is not on PM's VoLTE whitelist.   You can check your phone's VoLTE compatibility here:
https://www.publicmobile.ca/en/get-help/articles/volte 

2. Yes, you will need a newer model of phone that is compatible with PM's VoLTE network.  For example, an A55, A56, A15, A16 will work.

[hairbag1]

@grqmpakilt 

here's some reading and a devise checker at the bottom. 

https://www.publicmobile.ca/en/get-help/articles/volte