diff --git a/Makefile b/Makefile
index 95be347..1a97d02 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CFLAGS+=-I/usr/include/wireshark -DHAVE_STDARG_H -DHAVE_CONFIG_H -g
-OBJECTS:=src/packet-isi.o src/plugin.o src/isi-simauth.o src/isi-network.o src/isi-gps.o
+OBJECTS:=src/packet-isi.o src/plugin.o src/isi-sim.o src/isi-simauth.o src/isi-network.o src/isi-gps.o
 
 PREFIX?=/usr
 PLUGINDIR?=lib/wireshark/libwireshark0/plugins
diff --git a/src/isi-sim.c b/src/isi-sim.c
new file mode 100644
index 0000000..04adcae
--- /dev/null
+++ b/src/isi-sim.c
@@ -0,0 +1,123 @@
+/* isi-simauth.c
+ * Dissector for ISI's SIM resource
+ * Copyright 2010, Tyson Key <tyson.key@gmail.com>
+ * Copyright 2010, Sebastian Reichel <sre@ring0.de>
+ * 
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+#include <epan/prefs.h>
+#include <epan/packet.h>
+
+#include "packet-isi.h"
+#include "isi-sim.h"
+
+static const value_string isi_sim_message_id[] = {
+	{0x19, "SIM_NETWORK_INFO_REQ"},
+	{0x1A, "SIM_NETWORK_INFO_RESP"},
+	{0x1D, "SIM_IMSI_REQ_READ_IMSI"},
+	{0x1E, "SIM_IMSI_RESP_READ_IMSI"},
+	{0x21, "SIM_SERV_PROV_NAME_REQ"},
+	{0x22, "SIM_SERV_PROV_NAME_RESP"},
+	{0xBA, "SIM_READ_FIELD_REQ"},
+	{0xBB, "SIM_READ_FIELD_RESP"},
+	{0xBC, "SIM_SMS_REQ"},
+	{0xBD, "SIM_SMS_RESP"},
+	{0xDC, "SIM_PB_REQ_SIM_PB_READ"},
+	{0xDD, "SIM_PB_RESP_SIM_PB_READ"},
+	{0xEF, "SIM_IND"},
+	{0xF0, "SIM_COMMON_MESSAGE"},
+	{0x00, NULL}
+};
+
+static const value_string isi_sim_service_type[] = {
+	{0x01, "SIM_ST_PIN"},
+	{0x05, "SIM_ST_ALL_SERVICES"},
+	{0x0D, "SIM_ST_INFO"},
+	{0x2C, "SIM_ST_READ_SERV_PROV_NAME"},
+	{0x0F, "SIM_PB_READ"},
+	{0x2D, "READ_IMSI"},
+	{0x2F, "READ_HPLMN"},
+	{0x52, "READ_PARAMETER"},
+	{0x53, "UPDATE_PARAMETER"},
+	{0x66, "ICC"},
+	{0x00, NULL}
+};
+
+
+
+static dissector_handle_t isi_sim_handle;
+static void dissect_isi_sim(tvbuff_t *tvb, packet_info *pinfo, proto_item *tree);
+
+static guint32 hf_isi_sim_message_id = -1;
+static guint32 hf_isi_sim_service_type = -1;
+
+void proto_reg_handoff_isi_sim(void) {
+	static gboolean initialized=FALSE;
+
+	if (!initialized) {
+		isi_sim_handle = create_dissector_handle(dissect_isi_sim, proto_isi);
+		dissector_add("isi.resource", 0x09, isi_sim_handle);
+	}
+}
+
+void proto_register_isi_sim(void) {
+	static hf_register_info hf[] = {
+	  	{ &hf_isi_sim_message_id,
+		  { "Message ID", "isi.sim.msg_id", FT_UINT8, BASE_HEX, isi_sim_message_id, 0x0, "Message ID", HFILL }},
+		  { &hf_isi_sim_service_type,
+		  { "Service Type", "isi.sim.service_type", FT_UINT8, BASE_HEX, isi_sim_service_type, 0x0, "Service Type", HFILL }}
+
+	};
+
+	proto_register_field_array(proto_isi, hf, array_length(hf));
+	register_dissector("isi.sim", dissect_isi_sim, proto_isi);
+}
+
+static void dissect_isi_sim(tvbuff_t *tvb, packet_info *pinfo, proto_item *isitree) {
+	proto_item *item = NULL;
+	proto_tree *tree = NULL;
+	guint8 cmd, code;
+
+	if(isitree) {
+		item = proto_tree_add_text(isitree, tvb, 0, -1, "Payload");
+		tree = proto_item_add_subtree(item, ett_isi_msg);
+
+		proto_tree_add_item(tree, hf_isi_sim_message_id, tvb, 0, 1, FALSE);
+		cmd = tvb_get_guint8(tvb, 0);
+
+		switch(cmd) {
+
+			case 0x1D: /* SIM_IMSI_REQ_READ_IMSI isi_sim_service_type */
+				proto_tree_add_item(tree, hf_isi_sim_service_type, tvb, 1, 1, FALSE);
+				code = tvb_get_guint8(tvb, 1);
+				switch(code) {
+					case 0x2D: //READ_IMSI
+						col_set_str(pinfo->cinfo, COL_INFO, "Read IMSI");
+						break;
+					default:
+						col_set_str(pinfo->cinfo, COL_INFO, "unknown SIM packet");
+						break;
+				}
+				break;
+			default:
+				col_set_str(pinfo->cinfo, COL_INFO, "Unknown type");
+				break;
+		}
+	}
+}
diff --git a/src/isi-sim.h b/src/isi-sim.h
new file mode 100644
index 0000000..07b75d4
--- /dev/null
+++ b/src/isi-sim.h
@@ -0,0 +1,7 @@
+#ifndef _ISI_SIM_H
+#define _ISI_SIM_H
+
+void proto_reg_handoff_isi_sim(void);
+void proto_register_isi_sim(void);
+
+#endif
diff --git a/src/packet-isi.c b/src/packet-isi.c
index 8c88f15..eaf2690 100644
--- a/src/packet-isi.c
+++ b/src/packet-isi.c
@@ -25,6 +25,7 @@
 
 #include "packet-isi.h"
 #include "isi-network.h"
+#include "isi-sim.h"
 #include "isi-simauth.h"
 #include "isi-gps.h"
 
@@ -88,6 +89,7 @@ void proto_reg_handoff_isi(void) {
 
 		/* handoff resource dissectors */
 		proto_reg_handoff_isi_sim_auth();
+		proto_reg_handoff_isi_sim();
 		proto_reg_handoff_isi_network();
 		proto_reg_handoff_isi_gps();
 	}
@@ -140,6 +142,7 @@ void proto_register_isi(void) {
 	isi_resource_dissector_table = register_dissector_table("isi.resource", "ISI resource", FT_UINT8, BASE_HEX);
 
 	/* register resource dissectors */
+	proto_register_isi_sim();
 	proto_register_isi_sim_auth();
 	proto_register_isi_network();
 	proto_register_isi_gps();