The Wifi app can’t connect to any devices of my house for a week now. Why? Maybe the want me to “swi

Hi Alexandre,
I understand and I'm sorry for the inconvenience.
Do let us know in detail, what error do you encounter with the Fizz Wi-Fi app, what does it say on your phone's display?
You can try to uninstall the app, clear the cache memory from your phone and reinstall it before checking again.
If that doesn't work, did you also try to factory reset the modem and see if it connects afterwards?
You can perform a factory reset of the modem by using a sharp object to press on the small button in the orifice behind the modem for 15 to 20 seconds, then let the modem reboot itself and see if you can connect to the app.
Thank you very much for your understanding.
Have a good one!
Andrei