Netatmo apps for Android can be downloaded from Google Play.
As of May 2020, some smartphone models are no longer certified by Google, so they no longer use Google Mobile services and therefore Google Play.
Netatmo applications use a set of Google services to function, if these services are not available, they will work in degraded mode.
In degraded mode, you will not be able to receive notifications, calls on your doorbell or use the geolocation of your phone to detect if you left home, but you will still be able to monitor what takes place at your home and install your products.
Updated