title: getAllCellInfo returns null in android 4.2.1
body: <p>My Android version is 4.2.1 and I am trying to make use of <code>TelephonyManager.getAllCellInfo()</code> method. In my manifest file I have the <code>ACCESS_COARSE_UPDATES</code>, <code>ACCESS_COARSE_LOCATION</code>, <code>ACCESS_FINE_LOCATION</code> permissions. However that method returns <code>null</code>.</p>