iOS notifications - how am I getting them while off of my home network?

Hello,

I have a simple “door is open” automation that triggers a iOS HA mobile app notification for telling me when a door is open. This automation works and displays a notification on my phone even when I am not on my home network. I am not currently subscribed to Home Assistant Cloud, and I don’t have remote access to my HA server set up yet, so I am not sure how I am getting these notifications.

Ultimately I do want to get mobile notifications regardless of whether I am on my home network or not, I just want to better understand how they are getting to my mobile device at present. Any help is appreciated!

Thanks

The app uses Firebase cloud messaging:

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I see, thanks @tom_l ! Very cool that it is free and it has been super reliable!