diff --git a/pySim-prog.py b/pySim-prog.py
index 4f549634..662824c4 100755
--- a/pySim-prog.py
+++ b/pySim-prog.py
@@ -31,12 +31,7 @@ import random
 import re
 import sys
 import traceback
-
-try:
-	import json
-except ImportError:
-	# Python < 2.5
-	import simplejson as json
+import json
 
 from pySim.commands import SimCardCommands
 from pySim.cards import _cards_classes, card_detect
diff --git a/pySim/utils.py b/pySim/utils.py
index f7190d43..6dbd980f 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -720,20 +720,13 @@ def get_addr_type(addr):
 	if not len(addr):
 		return None
 
-	import sys
-	# Handle python3 and python2 - unicode
-	if sys.version_info[0] < 3:
-		addr_str = unicode(addr)
-	else:
-		addr_str = addr
-
 	addr_list = addr.split('.')
 
 	# Check for IPv4/IPv6
 	try:
 		import ipaddress
 		# Throws ValueError if addr is not correct
-		ipa = ipaddress.ip_address(addr_str)
+		ipa = ipaddress.ip_address(addr)
 
 		if ipa.version == 4:
 			return 0x01
diff --git a/tests/pysim-test.sh b/tests/pysim-test.sh
index 7ee98345..4004c189 100755
--- a/tests/pysim-test.sh
+++ b/tests/pysim-test.sh
@@ -23,6 +23,7 @@
 PYSIM_PROG=../pySim-prog.py
 PYSIM_READ=../pySim-read.py
 TEMPFILE=temp.tmp
+PYTHON=python3
 
 set -e
 
@@ -76,7 +77,7 @@ function check_card {
     CARD_NAME=$2
     echo "Verifying card ..."
     stat ./$CARD_NAME.ok > /dev/null
-    python $PYSIM_READ -p $TERMINAL > $TEMPFILE
+    $PYTHON $PYSIM_READ -p $TERMINAL > $TEMPFILE
     set +e
     CARD_DIFF=$(diff $TEMPFILE ./$CARD_NAME.ok)
     set -e
@@ -106,7 +107,7 @@ function check_card {
 function gen_ok_file {
     TERMINAL=$1
     CARD_NAME=$2
-    python $PYSIM_READ -p $TERMINAL > "$CARD_NAME.ok"
+    $PYTHON $PYSIM_READ -p $TERMINAL > "$CARD_NAME.ok"
     echo "Generated file: $CARD_NAME.ok"
     echo "------------8<------------"
     cat "$CARD_NAME.ok"
@@ -166,7 +167,7 @@ function run_test {
 		ADM_OPT="-A"
 		ADM=$ADM_HEX
 	fi
-	python $PYSIM_PROG -p $I -t $CARD_NAME -o $OPC -k $KI -x $MCC -y $MNC -i $IMSI -s $ICCID --msisdn $MSISDN $ADM_OPT $ADM
+	$PYTHON $PYSIM_PROG -p $I -t $CARD_NAME -o $OPC -k $KI -x $MCC -y $MNC -i $IMSI -s $ICCID --msisdn $MSISDN $ADM_OPT $ADM
 	check_card $I $CARD_NAME
 	echo ""
     done