diff --git a/sim-applet/src/org/osmocom/IMSIPseudo/IMSIPseudo.java b/sim-applet/src/org/osmocom/IMSIPseudo/IMSIPseudo.java
index 4847ce0..ac298a5 100755
--- a/sim-applet/src/org/osmocom/IMSIPseudo/IMSIPseudo.java
+++ b/sim-applet/src/org/osmocom/IMSIPseudo/IMSIPseudo.java
@@ -263,6 +263,25 @@
 		return mi;
 	}
 
+	private byte nibble2hex(byte nibble)
+	{
+		nibble = (byte)(nibble & 0xf);
+		if (nibble < 0xa)
+			return (byte)('0' + nibble);
+		else
+			return (byte)('a' + nibble - 0xa);
+	}
+
+	private byte[] hexdump(byte data[])
+	{
+		byte res[] = new byte[(byte)(data.length*2)];
+		for (byte i = 0; i < data.length; i++) {
+			res[(byte)(i*2)] = nibble2hex((byte)(data[i] >> 4));
+			res[(byte)(i*2 + 1)] = nibble2hex(data[i]);
+		}
+		return res;
+	}
+
 	private void showIMSI() {
 		/* 3GPP TS 31.102 4.2.2: IMSI */
 		byte[] IMSI = new byte[9];