Some say it is for future mounting of a cellular dongle that will be released in some markets. That would then plug into the host USB-C port on the front.
Rick from DroneValley suspects, that the two on the rear side may hold a 4G device, which hooks up to the Host USB C-port.
Not sure though, if, then as with others, this might only apply to Asia and not the US or Europe I suspect.
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