Why SMS are not sent for unknown state

snippet_nagios_notify.sh

# Do not alert state UNKKNOWN
if [[ "${TYPE}" == "PROBLEM" && "${STATE}" == "UNKNOWN" ]] ; then
    EMAIL=false
    SMS=false
    X_SERVICE=$(echo "${SERVICE}" | tr -d '/')
    # Safe host and service in ${UNKNOWN_STATE} file
    echo "${HOST}: ${X_SERVICE}" >> ${UNKNOWN_STATE}
fi

# Remove host and service from ${UNKNOWN_STATE} file in case of new PROBLEM
if [[ "${TYPE}" == "PROBLEM" && "${STATE}" != "UNKNOWN" ]] ; then
    X_SERVICE=$(echo "${SERVICE}" | tr -d '/')
    grep "^${HOST}: ${X_SERVICE}$" ${UNKNOWN_STATE} > /dev/null 2>&1
    if [ $? -eq 0 ] ; then
        sed -i "/^${HOST}: ${X_SERVICE}$/d" ${UNKNOWN_STATE}
    fi
fi

# Don't send RECOVERY when last state was UNKNOWN
# Remove host and service from ${UNKNOWN_STATE} file 
if [ "${TYPE}" == "RECOVERY" ] ; then
    X_SERVICE=$(echo "${SERVICE}" | tr -d '/')
    grep "^${HOST}: ${X_SERVICE}$" ${UNKNOWN_STATE} > /dev/null 2>&1
    if [ $? -eq 0 ] ; then
        EMAIL=false
        SMS=false
        sed -i "/^${HOST}: ${X_SERVICE}$/d" ${UNKNOWN_STATE}
    fi
fi