title: Android: How do I get GSM signal strength for all available network operators
body: <p>I am working on a little app to check the signal strength of various network operators in my area. My current operators signal is quite unstable and I want to look into the strength of other GSM operators.</p>
  
  <p>Sofar I've been using the TelephonyManager and a PhoneStateListener with the onSignalStrengthsChanged call back to get the GSM Signal strength of the current network operator, but it seems that this class only gives me info on the signal strength of the network attached to my SIM card. </p>
  
  <p>I'm interested in measurement of GSM signal strength of ALL available operators. Searching the net has given vague hints on using internal android classes, but I've not yet found any good examples on this.</p>
  
  <p>Any answer that can move me on to get a list of all available network operators and their signal strength are appreaciated.</p>