--- /opt/env/gsm/local/lib/python2.7/site-packages/gsmmodem/modem.py-default	2016-03-15 12:19:15.867269334 +0300
+++ /opt/env/gsm/local/lib/python2.7/site-packages/gsmmodem/modem.py	2016-03-16 10:11:14.892414681 +0300
@@ -361,6 +361,7 @@
         self.write('AT+CVHU=0', parseError=False) # Enable call hang-up with ATH command (ignore if command not supported)
     
     def _unlockSim(self, pin):
+        return
         """ Unlocks the SIM card using the specified PIN (if necessary, else does nothing) """
         # Unlock the SIM card if needed
         if self.write('AT+CPIN?')[0] != '+CPIN: READY':