if I cancel internet service with fizz, could I return the modem in person not by Canada post?
No you have to give it to post canada.
Just because I stay in montreal.
Not possible. Fizz is 100% online.
If you do return it, make sure you do within 15 days after your unsubscription, or pay 225$ (https://fizz.ca/en/faq/how-do-i-return-my-wi-fi-modem )
You have deposit places at https://fizz.ca/faq/find-a-deposit-location
Montreal dont have canada post ????
No, you have to return it via Canada Post. There is no in-person drop off.
Is the box able to fit in a street mailbox?
A box of size 12 ¼ x 9 ¼ x 5 ¼ inches is ideal.
source and more about the box: https://fizz.ca/en/faq/what-size-box-do-i-need