android: NeighboringCellInfo always empty !? why?

Question

i'm trying to get info about the neighboring cells my phone can "see" atm. so far so good. i do this like this:

telManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
//...
ArrayList<NeighboringCellInfo> neighboringCellList = (ArrayList<NeighboringCellInfo>) telManager.getNeighboringCellInfo();

unfortunately, this list turns out to be empty all the time. even in different places. i live in berlin, so i don't think it's because there is actually just the one cell available!

update: my permissions look like this:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_UPDATES" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />

Answer 1

I've seen several questions on the same issue but it seems like none of them got a good and deterministic solution. The most common suggestion is to make sure you have the correct permission (which I see you do in your question) and there are some that say that this only works on 2G and not 3G.

Take a look at the following similar questions. It might point you in some new directions:

getNeighboringCellInfo() returning null list

Null Issue with NeighboringCellInfo, CID and LAC

Get neighboring cell in Android returns null