How can I change Fido to Fizz?

You will just paid the 5$ for the sim with fizz.

To transfert your number just do this:

1. Click Transfer a number to Fizz.
2. Enter your phone number in the field that opens up below.
3. Use the drop-down to choose your previous provider.
4. Enter your previous provider’s account number or your phone’s IMEI# in the field below. Find your account number on your bill. Dial *#06# on your phone to get your 15-digit IMEI number. Only the IMEI phone number used at your current provider will allow the transfer. If the number is more than 15 digits long, enter only the first 15 digits.
5. Click Next, review your first monthly plan payment and click Submit.