--- a/simtool/hlread.c	Mon Jan 25 02:16:16 2021 +0000
+++ b/simtool/hlread.c	Mon Jan 25 04:54:47 2021 +0000
@@ -92,3 +92,35 @@
 	printf("%s parity=%c len=%u\n", buf + 1, buf[0], sim_resp_data[0]);
 	return(0);
 }
+
+cmd_spn()
+{
+	int rc;
+	unsigned textlen;
+
+	rc = select_op(DF_GSM);
+	if (rc < 0)
+		return(rc);
+	rc = select_op(EF_SPN);
+	if (rc < 0)
+		return(rc);
+	rc = parse_ef_select_response();
+	if (rc < 0)
+		return(rc);
+	if (curfile_structure != 0x00 || curfile_total_size != 17) {
+		fprintf(stderr, "error: expected transparent EF of 17 bytes\n");
+		return(-1);
+	}
+	rc = readbin_op(0, 17);
+	if (rc < 0)
+		return(rc);
+	printf("Display condition: %02X\n", sim_resp_data[0]);
+	printf("SPN: ");
+	rc = validate_alpha_field(sim_resp_data + 1, 16, &textlen);
+	if (rc >= 0)
+		print_alpha_field(sim_resp_data, textlen, stdout);
+	else
+		printf("malformed alpha field");
+	putchar('\n');
+	return(0);
+}