The smartwatch is not directly compatible with Samsung Health. Fitbit devices primarily synchronise their data with the Fitbit app. However, there are third-party apps such as "Health Sync" that can be used to transfer Fitbit data on Android devices to Samsung Health, but this is not an official or native integration. The Fitbit app itself runs on Samsung smartphones, but a direct connection or synchronisation with Samsung Health is not officially supported by Fitbit.
The watch is compatible with iPhone 11 as it works with both Android and iOS devices. You can connect it to your iPhone via Bluetooth to receive fitness data and notifications. However, the watch will not appear in the Health app as it is managed via the Fitbit app. To use it, you need to download the Fitbit app and connect the watch via Bluetooth.
No, tracking activities such as running is included in the basic version and does not require a subscription.
See https://www.fitbit.com/global/fr-ch/products/services/premium for a detailed (and not necessarily very clear) table.
We should also be able to deliver the item then, but this has not been confirmed to us yet, so we do not give a delivery date. We hope to be able to change this in the near future.