--- a/simtool/plmnsel.c	Wed Feb 17 23:19:00 2021 +0000
+++ b/simtool/plmnsel.c	Wed Feb 17 23:25:47 2021 +0000
@@ -167,3 +167,16 @@
 	}
 	return(0);
 }
+
+cmd_plmnsel_erase_all(argc, argv)
+	char **argv;
+{
+	int rc;
+	u_char ffbuf[255];
+
+	rc = select_ef_plmnsel();
+	if (rc < 0)
+		return(rc);
+	memset(ffbuf, 0xFF, curfile_total_size);
+	return update_bin_op(0, ffbuf, curfile_total_size);
+}