What are the steps to use my existing Koodo phone number with Fizz?

Don't cancel if you want to transfer. When you'll do the setup, it will suggest if you want to keep your phone number. You'll need your Koodo account number.

Just order a sim and activate it.
Follow the steps to keep you're number, its very easy forward
Make sure not to cancel your old plan

Use IMEI is kind of universal.

In order to be able to transfer your number, the late has to be active with your old provider.

Just follow the faq: https://fizz.ca/en/faq/activation-how-do-i-transfer-my-cu...