title: Multiple commands to a GSM 3G modem
body: <p>I'm using C# to command a GSM/GPRS modem via a serial port.</p>
  
  <p>Can I write the commands to the port one after another without a gap or should I wait for the response form the modem after the last command? Using something like Thread.Sleep.</p>
  
  <p>I use it to send SMS to multiple phone numbers.</p>
  
  <p>=======</p>