title: AT command to register to network
body: <p>I am trying use a ZTE Modem for testing purpose to send and receive sms on c# application.
  This is the modem I am using.
  <a href="http://www.flipkart.com/zte-mf190-3g-data-card/p/itmdhhrb6jwx9gjs" rel="nofollow">http://www.flipkart.com/zte-mf190-3g-data-card/p/itmdhhrb6jwx9gjs</a>.</p>
  
  <p>I am facing a problem when the software that is comes with the device is open, the device is registered to network as soon I close that software, the light on modem become red.</p>
  
  <p>I thinks that the software comes with device sending a command to modem to register to network, but don't know which</p>
  
  <p>I tried with AT+COPS=0 </p>
  
  <p>but no luck.</p>
  
  <p>Any suggestions?</p>