Answered question
Change my cell phone and now my line doesn't work
Did you reconfigre APN parameter https://fizz.ca/en/faq/what-are-fizz-network-settings-apn ?
Is your new phone compatible with Fizz https://fizz.ca/en/faq/compatible-devices ?
Other answers
Can you explain?
No signal, no calls, no data, ...
The sim is recognize?
Do you have two slots?
Etc
Please be more specific what's the problem.
Do you still have your old phone to try the SIM?
Check your Fizz account to make sure your plan is active and nothing has changed