HTC is working with fizz?

Check that your phone supports bands Fizz uses:

https://fizz.ca/en/faq/compatible-devices

Frequencies

You go to setting, about this phone, you'll see the exact model.
 
Look at 
https://www.frequencycheck.com
For your device, then click "check country/carrier compatibility" and look for Videotron.
 
You need to have theses frequencies on your phone :

Calls: Your device must support HSPA 850 MHz or 1900 MHz frequencies

Mobile data: Your device must have dual-frequency support for 1700/2100 MHz (also called AWS or band 4)

most of the HTC should work with Fizz's frequency. To be sure, verify the spec of your model and the Fizz's frequency as mention by @Sergio.

HTC should work with Fizz.