typedef enum {
  VM_GSM_SMS_SORT_NONE,
  VM_GSM_SMS_SORT_TIMESTAMP,
  VM_GSM_SMS_SORT_MESSAGE_TYPE,
  VM_GSM_SMS_SORT_STORAGE_TYPE,
  VM_GSM_SMS_SORT_NUMBER,
  VM_GSM_SMS_SORT_CONTENT,
  VM_GSM_SMS_SORT_PROTOCOL_IDENTIFIER,
  VM_GSM_SMS_SORT_SIM_ID
} VM_GSM_SMS_SORT;