Typically these services are intended to allow the modem to access factor calibration data, possibly page firmware in, or to store nonvolatile information it ne

Typically these services are intended to allow the modem to access factor calibration data, possibly page firmware in, or to store nonvolatile information it needs longer term. They should be restricted to just storing data on behalf of the modem and not providing broader filesystem access (that's at the very least (assuming incompetence rather than malice) a bug).