no service on my phone

Can you give us a bit more informations?
When did you have activated your account?

Is your phone compatible?
https://fizz.ca/en/faq/compatible-devices

Do you have the network operator settled in automatic?

Android: Settings → Connections → Mobile networks → Network operators → Search networks → Automatic/Fizz

iPhone: Settings → Operators → Automatic/Fizz

If nothing else you can try to reset the network settings

Reset your phone’s network settings
IMPORTANT: This operation will also reset your WiFi settings, mobile data, Bluetooth, etc.

The steps to follow to reset your network settings will vary depending on the type of device. Here are two examples:

Android: Settings → General management → Reset → Reset network settings

iPhone: Settings → General → Reset → Reset network settings

You can contact Fizz support by chat, from 8 AM to 9 PM everyday:

1- Connect to your Fizz account by clicking « Login » in the top right corner at fizz.ca
2- Click on this link: https://fizz.ca/en/faq/what-can-i-do-if-mobile-network-coverage-is-weak-or-inaccessible
3- The green chat bubble should appear after a few seconds in the bottom right corner.

Did you have service before or you're a new user ?

Is there a message in your account? Problem with your credit card?