diff --git a/pySim/utils.py b/pySim/utils.py
index e5434a5a..43e4c535 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -180,7 +180,7 @@ def dec_xplmn_w_act(fivehexbytes):
 
 def format_xplmn_w_act(hexstr):
 	s = ""
-	for rec_data in hexstr_to_fivebytearr(hexstr):
+	for rec_data in hexstr_to_Nbytearr(hexstr, 5):
 		rec_info = dec_xplmn_w_act(rec_data)
 		if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF:
 			rec_str = "unused"
@@ -229,7 +229,7 @@ def dec_xplmn(threehexbytes):
 
 def format_xplmn(hexstr):
 	s = ""
-	for rec_data in hexstr_to_threebytearr(hexstr):
+	for rec_data in hexstr_to_Nbytearr(hexstr, 3):
 		rec_info = dec_xplmn(rec_data)
 		if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF:
 			rec_str = "unused"
diff --git a/pySim/utils_test.py b/pySim/utils_test.py
index ff028dad..8db04bdd 100644
--- a/pySim/utils_test.py
+++ b/pySim/utils_test.py
@@ -12,7 +12,7 @@ class DecTestCase(unittest.TestCase):
 			"ffffff0002",
 			"ffffff0001",
 		]
-		self.assertEqual(utils.hexstr_to_fivebytearr(input_str), expected)
+		self.assertEqual(utils.hexstr_to_Nbytearr(input_str, 5), expected)
 
 	def testDecMCCfromPLMN(self):
 		self.assertEqual(utils.dec_mcc_from_plmn("92f501"), 295)