diff --git a/pySim-prog.py b/pySim-prog.py
index ee5bc98c..91497093 100755
--- a/pySim-prog.py
+++ b/pySim-prog.py
@@ -432,7 +432,7 @@ def print_parameters(params):
 	if 'smsp' in params:
 		s.append(" > SMSP     : %(smsp)s")
 	s.append(" > ICCID    : %(iccid)s")
-	s.append(" > MCC/MNC  : %(mcc)d/%(mnc)d")
+	s.append(" > MCC/MNC  : %(mcc)s/%(mnc)s")
 	s.append(" > IMSI     : %(imsi)s")
 	s.append(" > Ki       : %(ki)s")
 	s.append(" > OPC      : %(opc)s")
@@ -483,8 +483,8 @@ def _read_params_csv(opts, iccid=None, imsi=None):
 def read_params_csv(opts, imsi=None, iccid=None):
 	row = _read_params_csv(opts, iccid=iccid, imsi=imsi)
 	if row is not None:
-		row['mcc'] = int(row.get('mcc', row['imsi'][0:3]))
-		row['mnc'] = int(row.get('mnc', row['imsi'][3:5]))
+		row['mcc'] = row.get('mcc', row['imsi'][0:3])
+		row['mnc'] = row.get('mnc', row['imsi'][3:5])
 		pin_adm = None
 		# We need to escape the pin_adm we get from the csv
 		if 'pin_adm' in row:
diff --git a/pySim/utils.py b/pySim/utils.py
index 65f10c5c..a68af0a6 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -98,7 +98,7 @@ def enc_iccid(iccid):
 
 def enc_plmn(mcc, mnc):
 	"""Converts integer MCC/MNC into 3 bytes for EF"""
-	return swap_nibbles(lpad('%d' % mcc, 3) + lpad('%d' % mnc, 3))
+	return swap_nibbles(lpad('%d' % int(mcc), 3) + lpad('%d' % int(mnc), 3))
 
 def dec_spn(ef):
 	byte1 = int(ef[0:2])