I have tried this with a pc running fedora.dongle is huwawei e153.but when i run the program, terminal will go to blocked state. after some time i pressed Ctrl+C. result was : Traceback (most recent call last): File "sms.py", line 11, in sendatcmd('+CMGF=1') File "sms.py", line 8, in sendatcmd def sendatcmd(cmd):dongle.write('AT'+cmd+'r') File "/home/uthpala/Downloads/pith/pyserial-2.6/serial/serialposix.py", line 475, in write n = os.write(self.fd, d) KeyboardInterrupt What can i do for this? This thing is helpful for my project.help me to get through. Thank You so much.