title: iPhone iOS: how to detect when in roaming? (Not for jailbreaked phones)
body: <p>I'm coding an app with heavy network usage. I've been told to warn users for costs but only when in roaming mode. 
  I know theres some way to know when the phone is roaming comparing two undocumented files on jailbreaked iphones. But I need to find out how to for non jailbreaked phones.
  BTW found nothing at SCNetworkReachability api.</p>
  
  <p>Ty!</p>