diff --git a/pySim/utils.py b/pySim/utils.py
index 777638c..def88f0 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -173,7 +173,8 @@
 	Returns:
         Tuple of (tag:int, remainder:bytes)
 	"""
-	if binary[0] == 0xff:
+	# check for FF padding at the end, as customary in SIM card files
+	if binary[0] == 0xff and len(binary) == 1 or binary[0] == 0xff and binary[1] == 0xff:
 		return None, binary
 	tag = binary[0] & 0x1f
 	if tag <= 30: