title: getNeighboringCellInfo() returning null list
body: <p>I'm struggling a little trying to get neighbour cells info (for the current cell info, everything works fine):</p>
  
  <pre><code>mTelephMgr=(TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
  neighbours=mTelephMgr.getNeighboringCellInfo();
  </code></pre>
  
  <p>I've tried with 2G/3G networks, with Galaxy S (2.2.1) &amp; Nexus S (2.3.1), and two different carriers but I always get an empty list for neighbours. The networks are GSM based (Spain).</p>
  
  <p>I've been googling for a while, and whereas some people are reporting the same issue, other seem to have the function working perfectly.</p>
  
  <p>Any suggestions?</p>
  
  <p>Many thanks in advance.</p>