diff --git a/pySim/transport/__init__.py b/pySim/transport/__init__.py
index fb8f31d1..923787b6 100644
--- a/pySim/transport/__init__.py
+++ b/pySim/transport/__init__.py
@@ -68,7 +68,7 @@ class LinkBase(object):
 				data : string (in hex) of returned data (ex. "074F4EFFFF")
 				sw   : string (in hex) of status word (ex. "9000")
 		"""
-		pass
+		return self._send_apdu_raw(pdu)
 
 	def send_apdu(self, pdu):
 		"""Sends an APDU and auto fetch response data
diff --git a/pySim/transport/calypso.py b/pySim/transport/calypso.py
index 467d5ee2..3c223e64 100644
--- a/pySim/transport/calypso.py
+++ b/pySim/transport/calypso.py
@@ -115,7 +115,7 @@ class CalypsoSimLink(LinkBase):
 	def wait_for_card(self, timeout = None, newcardonly = False):
 		pass # Nothing to do really ...
 
-	def send_apdu_raw(self, pdu):
+	def _send_apdu_raw(self, pdu):
 
 		# Request FULL reset
 		req_msg = L1CTLMessageSIM(h2b(pdu))
diff --git a/pySim/transport/modem_atcmd.py b/pySim/transport/modem_atcmd.py
index fccd3881..f5a0f238 100644
--- a/pySim/transport/modem_atcmd.py
+++ b/pySim/transport/modem_atcmd.py
@@ -97,7 +97,7 @@ class ModemATCommandLink(LinkBase):
 	def wait_for_card(self, timeout=None, newcardonly=False):
 		pass # Nothing to do really ...
 
-	def send_apdu_raw(self, pdu):
+	def _send_apdu_raw(self, pdu):
 		# Prepare the command as described in 8.17
 		cmd = 'AT+CSIM=%d,\"%s\"' % (len(pdu), pdu)
 
diff --git a/pySim/transport/pcsc.py b/pySim/transport/pcsc.py
index f08f71a4..2433e792 100644
--- a/pySim/transport/pcsc.py
+++ b/pySim/transport/pcsc.py
@@ -71,7 +71,7 @@ class PcscSimLink(LinkBase):
 		self.connect()
 		return 1
 
-	def send_apdu_raw(self, pdu):
+	def _send_apdu_raw(self, pdu):
 
 		apdu = h2i(pdu)
 
diff --git a/pySim/transport/serial.py b/pySim/transport/serial.py
index 6d393036..22788a90 100644
--- a/pySim/transport/serial.py
+++ b/pySim/transport/serial.py
@@ -180,7 +180,7 @@ class SerialSimLink(LinkBase):
 	def _rx_byte(self):
 		return self._sl.read()
 
-	def send_apdu_raw(self, pdu):
+	def _send_apdu_raw(self, pdu):
 
 		pdu = h2b(pdu)
 		data_len = ord(pdu[4])	# P3