title: Scan for cellular networks
body: <p>I want to get a list of the cellular networks in range, and I want to refresh it from time to time.</p>
  
  <p>In Android API 28, a method <code>TelephonyManager.requestNetworkScan(...)</code> is added. Unfortunately, I cannot set the minimum API to <code>28</code> in my app.</p>
  
  <p>Is there any way to get this method (from support library?) or to request a cellular network scan in any other way, or at least be informed when Android does a scan on its own?</p>