1.1.1.1 internet not working

Today I realized that even though the internet is connected to the phone it woruldnt show up and in 1.1.1.1 app it says disconnected and when I try to connect it just disconnects right away any tips thanks

Is it like the cloudflare warp VPN? Or is it just the DNS?

I reinstalled the app and it worked thanks for helping

Weirdly it happened with multiple iPhone devices that had the app installed in like a month with different iclouds and it worked differently for other phones another fix is settings-advanced-Conection options-Reset all settings
This will reset the app settings and after the initial setup it should work