diff --git a/pySim/transport/__init__.py b/pySim/transport/__init__.py
index c8079f6..1dd8d18 100644
--- a/pySim/transport/__init__.py
+++ b/pySim/transport/__init__.py
@@ -68,6 +68,10 @@
         self.proactive_handler = proactive_handler
 
     @abc.abstractmethod
+    def __str__(self):
+        """Implementation specific method for printing an information to identify the device."""
+
+    @abc.abstractmethod
     def _send_apdu_raw(self, pdu: Hexstr) -> ResTuple:
         """Implementation specific method for sending the PDU."""
 
diff --git a/pySim/transport/calypso.py b/pySim/transport/calypso.py
index 34fc646..b827d88 100644
--- a/pySim/transport/calypso.py
+++ b/pySim/transport/calypso.py
@@ -90,6 +90,9 @@
         self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
         self.sock.connect(sock_path)
 
+        # Remember socket path
+        self._sock_path = sock_path
+
     def __del__(self):
         self.sock.close()
 
@@ -156,3 +159,6 @@
         sw = rsp[-2:]
 
         return b2h(data), b2h(sw)
+
+    def __str__(self):
+        return "osmocon:%s" % (self._sock_path)
diff --git a/pySim/transport/modem_atcmd.py b/pySim/transport/modem_atcmd.py
index e99762d..58d6f9d 100644
--- a/pySim/transport/modem_atcmd.py
+++ b/pySim/transport/modem_atcmd.py
@@ -169,3 +169,6 @@
         sw = rsp_pdu[-4:].decode().lower()
         log.debug('Command response: %s, %s',  data, sw)
         return data, sw
+
+    def __str__(self):
+        return "modem:%s" % self._device
diff --git a/pySim/transport/pcsc.py b/pySim/transport/pcsc.py
index a01917f..41c4c19 100644
--- a/pySim/transport/pcsc.py
+++ b/pySim/transport/pcsc.py
@@ -39,6 +39,7 @@
             raise ReaderError('No reader found for number %d' % reader_number)
         self._reader = r[reader_number]
         self._con = self._reader.createConnection()
+        self._reader_number = reader_number
 
     def __del__(self):
         try:
@@ -91,3 +92,6 @@
 
         # Return value
         return i2h(data), i2h(sw)
+
+    def __str__(self):
+        return "PCSC:%u[%s]" % (self._reader_number,  self._reader)
diff --git a/pySim/transport/serial.py b/pySim/transport/serial.py
index 998d1d8..f4b1621 100644
--- a/pySim/transport/serial.py
+++ b/pySim/transport/serial.py
@@ -236,3 +236,6 @@
 
         # Return value
         return b2h(data), b2h(sw)
+
+    def __str__(self):
+        return "serial:%s" % (self._sl.name)