I'm doing some testing on the XBC-V1-UT (LTE CAT1). Often, when I query IM or S#, all I get back is an 'OK', not the actual IMEI or SIM/ICCID value. Even the DB does this, returning 'OK' instead of a value. Is there some other status value (AI?) which needs to be in a specific value before IM is readable? I'd like to suppress trying to read things when they can't be read.