diff --git a/card/ICC.py b/card/ICC.py
index 9a0d7ec..f6ba844 100644
--- a/card/ICC.py
+++ b/card/ICC.py
@@ -35,6 +35,7 @@ import re
 
 # smartcard python modules from pyscard
 from smartcard.CardType import AnyCardType
+from smartcard.CardType import ATRCardType
 from smartcard.CardRequest import CardRequest
 from smartcard.CardConnection import CardConnection
 from smartcard.ATR import ATR
@@ -141,7 +142,7 @@ class ISO7816(object):
         0xAB : 'Security Attribute expanded',
         }     
                
-    def __init__(self, CLA=0x00):
+    def __init__(self, atr=None, CLA=0x00):
         """
         connect smartcard and defines class CLA code for communication
         uses "pyscard" library services
@@ -149,7 +150,10 @@ class ISO7816(object):
         creates self.CLA attribute with CLA code
         and self.coms attribute with associated "apdu_stack" instance
         """
-        cardtype = AnyCardType()
+        if (atr):
+            cardtype = ATRCardType(atr)
+        else:
+            cardtype = AnyCardType()
         cardrequest = CardRequest(timeout=1, cardType=cardtype)
         self.cardservice = cardrequest.waitforcard()
         self.cardservice.connection.connect()
diff --git a/card/SIM.py b/card/SIM.py
index 2e6c9c7..ad81dae 100644
--- a/card/SIM.py
+++ b/card/SIM.py
@@ -100,12 +100,12 @@ class SIM(ISO7816):
     use self.dbg = 1 or more to print live debugging information
     """
     
-    def __init__(self):
+    def __init__(self, atr = None):
         """
         initialize like an ISO7816-4 card with CLA=0xA0
         can also be used for USIM working in SIM mode,
         """
-        ISO7816.__init__(self, CLA=0xA0)
+        ISO7816.__init__(self, atr, CLA=0xA0)
         
         if self.dbg >= 2:
             log(3, '(SIM.__init__) type definition: %s' % type(self))
diff --git a/card/USIM.py b/card/USIM.py
index ce1a62e..fd554af 100644
--- a/card/USIM.py
+++ b/card/USIM.py
@@ -177,7 +177,7 @@ class USIM(UICC):
     use self.dbg = 1 or more to print live debugging information
     """
     
-    def __init__(self):
+    def __init__(self, atr = None):
         """
         initializes like an ISO7816-4 card with CLA=0x00
         and checks available AID (Application ID) read from EF_DIR
@@ -185,7 +185,7 @@ class USIM(UICC):
         initializes on the MF
         """
         # initialize like a UICC
-        ISO7816.__init__(self, CLA=0x00)
+        ISO7816.__init__(self, atr, CLA=0x00)
         self.AID = []
         
         if self.dbg >= 2:
diff --git a/simcard.py b/simcard.py
index 6f83c44..4d8b7fe 100644
--- a/simcard.py
+++ b/simcard.py
@@ -85,7 +85,7 @@ class Simcard():
 	# Constructor: Create a new simcard object
 	def __init__(self, cardtype = GSM_USIM, atr = None):
 		if cardtype == GSM_USIM:
-			self.card = USIM()
+			self.card = USIM(atr)
 			self.usim = True
 
 			# Detect ISIM / USIM applications