title: Telephony Manager Method to see if the phone has a network
body: <p>Is there any method in telephony manager which can be used to see if the phone has any network?By that i mean i want to check if the phone has a telephone network, not if its has a data network. For example, if the user puts his phone on airplane mode, that means he doesn't have phone network to receive calls, send SMS etc. That's exactly the kind of thing i want to detect. Is there any method to do so?</p>
  
  <p>thanks.</p>