What do I do my Canada/ USA plan is not working in Florida?

@Suewhite1 Did you activate the roaming on your phone ?

Make sure to activate the roaming option of your phone, or else it'll block your usage. 

Also check this : https://fizz.ca/en/faq/im-travelling-outside-my-coverage-zone-and-cant-make-any-calls-why

Restart your phone

1. Reboot (power cycle) your phone by holding down the phone’s start button for 10 seconds.
2. After you reboot, your applications will reload. Your phone will then re-authenticate to the Fizz mobile network. This will allow your phone to recover its authorization to access the network

Make sure your phone selects the Fizz mobile network

1. IMPORTANT: Before starting this process, make sure the SIM card is inserted in your phone. Otherwise, the Mobile networks menu will not be visible.
2.  
3. The steps for enabling your phone to automatically select a network varies depending on the type of phone. Here are two examples:
4. Android: Settings → Connections → Mobile networks → Network operators → Search networks → Automatic/Fizz
5. iPhone: Settings → Operators → Automatic/Fizz
6.