It's not safe to remove this flags as it might lead to errors in the calls to the mozMobileConnection API and that would leave the UI broken (I mean in a inconsistent state). Try yourself, visit the call settings panel and right after opening the panel go back and visit the call settings panel again. We should not refresh the items until the last refresh call finishes. There are race conditions when calling the `getCallingLineIdRestriction()` and the getCallWaitingOption() and the getCallForwardingOption() functions from mozMobileConnection API in a row and the `_updatingInProgress` flash helped us to avoid race condition issues.