How To Identify Outgoing call Phone Number Through our Application
1. Use BroadcastReceiver.
2. Add Permission to Your Manifest File.
1.Add the following code 
public class OutgoingCallReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
             Bundle bundle = intent.getExtras();
             if(null == bundle)
                     return;
             String phonenumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
             Log.i("GetPhoneNumber",phonenumber);
             String outgoingNumber =  phonenumber;
             Toast.makeText(context, outgoingNumber , Toast.LENGTH_LONG).show();
     }
 }
2.In your Manifest
<receiver android:name=".OutgoingCallReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
            </intent-filter>
        </receiver>