4G roaming plan not connecting phone calls

[Clara5K]

We are on holiday in US from Canada. Purchased roaming/data/phone plan. Data &texting work but phone won't connect. I upgraded to 4G to make this work. Help please

[Clara5K]

i do not   have volte but  am on   lte network. Ttried T mobile but did not make a difference. 

[RavingRaven]

@Clara5K 

Does your phone have VOLTE? If not you will only be able to connect to T-Mobile's 2G network  for voice calls. If so download Textnow and choose a Canadian phone #. You can then use the 4G LTE network for voice calls.

 Check if your phone is on Public Mobile's whitelist.

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

[BKNS27]

@Clara5K 

You will need to connect to AT&T or T-Mobile network with Roamed ng enabled in your cellular settings.

Also, enable VoLTE settings. 
What is the make and model of your phone if you need help with the settings?

[Sansan]

Hi, try the following. 

If calls still don't work, put your phone to 2G and connect to T-Mobile. From the settings menu. Roaming on.

I hope this will be helpful.