how to update call logs through android applications
Uri allCalls = Uri.parse("content://call_log/calls");
  Cursor c = managedQuery(allCalls, null, null, null, null);

  if (c.moveToFirst()) {
     do{
        String callType = "";
        switch (Integer.parseInt(c.getString(
          c.getColumnIndex(Calls.TYPE))))
        {
              case 1: callType = "Incoming";
                 break;
              case 2: callType = "Outgoing";
                 break;
              case 3: callType = "Missed";
        }


           } while (c.moveToNext());


  }

  ContentValues values=new ContentValues();
  values.put("name", "Unknown");

  int k=getContentResolver().update(allCalls, values,null, null);