title: What exactly is scAddress in SmsManager's sendTextMessage function?
body: <p>I'm working on an application that will be sending a text message to another person from the app (this is not being published to the Play Store). I am looking at the documentation for SmsManager, and there is a parameter (which I currently have null), <code>scAddress</code>, which is described by:</p>
  
  <blockquote>
    <p>String: is the service center address or null to use the current default SMSC</p>
  </blockquote>
  
  <p>In short, I don't want the app to use my actual phone number to send out this text message. What exactly is the "service center address?"</p>
  
  <p>My application does not care about receiving a response for the text message. What happens if the user replies to this message? Is this related to the service center address?</p>
  
  <p>Thank you!</p>