title: Add CoreTelephony Framework in Xcode
body: <p>I've never worked in Xcode before since I just make my games in unity; however, one of the ad plugins I'm using wants me to perform the step below. How exactly do I add that framework in xcode(Also do I need to download the framework online or is it already included)? </p>
  
  <p>*— Step 4: Add CoreTelephony to your iOS project (iOS only)</p>
  
  <p>Add the <code>CoreTelephony</code> framework to the Xcode project that Unity generates.*</p>