List<HashMap<String, Object>> signalStrengths = new ArrayList<>();
                for (CellInfo cell : cellInfo) {
                    HashMap<String, Object> signalStrength = new HashMap<>();
                    String class_ = cell.getClass().getSimpleName();
                    signalStrength.put("class", class_);
                    switch (class_) {
                        case "CellInfoLte":
                            CellSignalStrengthLte lteSS = ((CellInfoLte) cell).getCellSignalStrength();
                            signalStrength.put("asu", lteSS.getAsuLevel());
                            signalStrength.put("dbm", lteSS.getDbm());
                            signalStrength.put("level", lteSS.getLevel());
                            break;
                        case "CellInfoWcdma":
                            CellSignalStrengthWcdma wcdmaSS = ((CellInfoWcdma) cell).getCellSignalStrength();
                            signalStrength.put("asu", wcdmaSS.getAsuLevel());
                            signalStrength.put("dbm", wcdmaSS.getDbm());
                            signalStrength.put("level", wcdmaSS.getLevel());
                            break;
                        case "CellInfoGsm":
                            CellSignalStrengthGsm gsmSS = ((CellInfoGsm) cell).getCellSignalStrength();
                            signalStrength.put("asu", gsmSS.getAsuLevel());
                            signalStrength.put("dbm", gsmSS.getDbm());
                            signalStrength.put("level", gsmSS.getLevel());
                            break;
                        default:
                            signalStrength.put("asu", null);
                            signalStrength.put("dbm", null);
                            signalStrength.put("level", null);
                    }
                    signalStrengths.add(signalStrength);
                }
                events.success(signalStrengths);