Garmin whatch face are safe?

7083972 said:

I have seen that many Watch faces of thirty party can access to the data of other applications

Where did you see that? A CIQ app installed on the watch cannot access the data of any other CIQ app. And it cannot access any data of phone apps at all (unless you install also a phone compagnon app).

7083972 said:

and send information through internet.

A CIQ app can only send information trough the web if it granted the permission to do so. If you fear the app could send some data from the watch to a remote server, check the specifications of the app, and choose the one not requiring any. The required permissions are listed on the main age of every CIQ app. For example:

You can also see there which data the app can access. Read more about the CIQ permissions here: https://developer.garmin.com/connect-iq/core-topics/manifest-and-permissions/ 

7083972 said:

Does this mean, for example, can they can read my sms, bank and WhatsApp messages and send them to their servers?

No. 

7083972 said:

I hope to be wrong

Indeed 

Hi Trux, thank you very much for the explanation. My worry came from Watch faces with these authorizations that are quite common:

-    GPS location

-   Run in the background when it is not active (potentially affecting battery life)

-   Heart rate, barometer, temperature, and altitude history

-   Your Garmin Connect fitness profile

-   Send/receive information to/from the Internet

-   Read and display data from other apps.

 -  Sensor data (i.e., ANT+, heart rate, compass)

With these permissions, it seems to me that a Watch con read my Sensor and Health Data and send it to a server. Am I wrong?

Other point is about “Read and display data from other apps". For me is not clear who the other Apps are. A notification shown on the watch from the Mobile app Bank, is it an "Other App"? But if I’m not wrong, you already said no.

Thanks