code: def networkName(self):
          
          copsMatch = lineMatching(r'^\+COPS: (\d),(\d),"(.+)",{0,1}\d*$', self.write('AT+COPS?')) # response format: +COPS: mode,format,"operator_name",x
          if copsMatch:
              return copsMatch.group(3)
docs: :return: the name of the GSM Network Operator to which the modem is connected