FP4 broadband modem connection & activity while in Airplane

Since Calyx is in beta now, I am currently thinking of getting a fp4 but got a couple questions regarding security on hardware level.
How is the Broadband Modem connected to the rest of the system? (Is it still on the soc like on fp2&3 or via internal usb?)
If the phone is in airplane mode does it still check in with the tower/is the modem still active?
If the phone is switched off does it still check in with the tower/is the modem still active or would the battery need to be removed?
If the phone has no sim card does it still check in with the tower/is the modem still active?
I couldnt really find any informations for the fp4 only 2&3.

Hi and welcome to the forum.

Why not ask Fairphone as this is ‘only’ a user forum :thinking:

support@fairphone.com

2 weeks and no responds from support so far - asked with email and website
Also on the original account “You can’t log in as Jake1 from that IP address.” Nice Try guess not buying from you then

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