Calls are not always coming through

Has your line been recently activated?

Otherwise have you tried these options presented in https://fizz.ca/en/faq/i-cant-receive-any-calls-on-my-phone ?

• Restart your phone
• Airplane mode or offline mode
• Is call forwarding activated?
• Is call blocking activated?
• Is the "Do not disturb" option active?
• Test using a different mobile phone

Also:

• make sure no app is blocking calls like a game for instance
• removing-replacing the SIM card could maybe break the jinx. You'd probably need to setup APN again tho. Here's how to quickly do it: https://fizz.ca/en/faq/what-are-fizz-network-settings-apn

Ultimately, chatting with Fizz could bring up some more options.