Cannot make calls

Hello Gardenia,
I am really sorry to hear that you encounter this situation,
I have verified your account and I see that you bought a Travel add-on for USA.
Can you please, contact us in private in order to try a few manipulations?
I will leave a few here in order to try and fix it, however, currently there is an issue that we are aware of regarding calls on USA.
You can verify this here: https://fizz.ca/en/faq/status-services

What you can try to see if it helps, is to connect your device on T-Mobile on 3G mode.
For your iPhone, to do that, go to settings> mobile data> mobile data options> Voice and Data> select 3G.
After you select that, please do a manual search for the T-Mobile network.
Go to settings> mobile data> network selection> tap on the automatic and switch it off> then manually search for the T-Mobile.
Then restart your phone and test the services.

In case this is not working, please contact us directly using this link: 
https://fizz.ca/en/contact-us

Thank you for your cooperation!
Have a good day!
-Eugen