Which Backbone Internet service behind Fizz mobile?is it VideoTron or Bell or some Major Provider?

is Videotron. It's using cable internet. Servive is as reliable as Videotron.

@J: the question was about Fizz mobile network, not the internet one.
@samir: due to multiple issues with the mobile network I suppose it is brand new.

Videotron. Fizz is a low cost Videotron company to compete low-cos companies.

That's interesting. I wonder why there are so many issues with the mobile and almost no issues with the internet then...

@samir: can you close the topic by choosing the best answer please?

Videotron as everybody says...

Vidéotron, since Fizz is owned by Videotron.