Answered question
Fizz offer SMS or MMS now, I'm confussed
In order to send MMS you must have data in your plan . If you do then you also need to configure APN parameters https://fizz.ca/en/faq/what-are-fizz-network-settings-apn
Other answers
Yes they offer both
SMS is only for text
MMS is for the media, is a SMS with media (pic, etc)
https://fizz.ca/en/faq/what-are-fizz-network-settings-apn
verify the APN
Should be something wrong on you APN settings, you can send a capture, maybe, so it will help us to find the issue
If after everything you are still not able to send and receive MMS try using the app "messages" from the store.It works for me and I also use a G6.
Fizz offers both SMS and MMS. If you don't have data on your plan, please add the free 250mb towards you plan to send MMS messages.
Good luck !