Get neighboring cell information, getNeighboringCellInfo().

TelephonyManager.getNeighboringCellInfo() return a List of neighboring cell information(NeighboringCellInfo), including Received Signal Strength and Cell ID location.

package com.AndroidTelephonyManager;

import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.telephony.NeighboringCellInfo;
import android.telephony.TelephonyManager;
import android.telephony.gsm.GsmCellLocation;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidTelephonyManager extends Activity {
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       TextView textGsmCellLocation = (TextView)findViewById(R.id.gsmcelllocation);
       TextView textMCC = (TextView)findViewById(R.id.mcc);
       TextView textMNC = (TextView)findViewById(R.id.mnc);
       TextView textCID = (TextView)findViewById(R.id.cid);

      
       //retrieve a reference to an instance of TelephonyManager
       TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
       GsmCellLocation cellLocation = (GsmCellLocation)telephonyManager.getCellLocation();
      
       String networkOperator = telephonyManager.getNetworkOperator();
       String mcc = networkOperator.substring(0, 3);
       String mnc = networkOperator.substring(3);
       textMCC.setText("mcc: " + mcc);
       textMNC.setText("mnc: " + mnc);
      
       int cid = cellLocation.getCid();
       int lac = cellLocation.getLac();
       textGsmCellLocation.setText(cellLocation.toString());
       textCID.setText("gsm cell id: " + String.valueOf(cid));
      
       TextView Neighboring = (TextView)findViewById(R.id.neighboring);
       List<NeighboringCellInfo> NeighboringList = telephonyManager.getNeighboringCellInfo();
      
       String stringNeighboring = "Neighboring List- Lac : Cid : RSSI\n";
       for(int i=0; i < NeighboringList.size(); i++){
        
        String dBm;
        int rssi = NeighboringList.get(i).getRssi();
        if(rssi == NeighboringCellInfo.UNKNOWN_RSSI){
         dBm = "Unknown RSSI";
        }else{
         dBm = String.valueOf(-113 + 2 * rssi) + " dBm";
        }

        stringNeighboring = stringNeighboring
         + String.valueOf(NeighboringList.get(i).getLac()) +" : "
         + String.valueOf(NeighboringList.get(i).getCid()) +" : "
         + dBm +"\n";
       }
      
       Neighboring.setText(stringNeighboring);
   }   
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<TextView 
   android:id="@+id/gsmcelllocation"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/mcc"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/mnc"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/cid"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<TextView 
   android:id="@+id/neighboring"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
</LinearLayout>