Merge "Improve documentation around null MNCs"

                        count = mccMncMap.get(mccMnc) + 1;

                    }

                    mccMncMap.put(mccMnc, count);

                    // This is unlikely, but if MCC from cell info looks different, we choose the

                    // MCC that occurs most.

                    // We keep track of the MCC+MNC combination that occurs most frequently, if

                    // there is one. A null MNC is treated like any other distinct MCC+MNC

                    // combination.

                    if (count > maxCount) {

                        maxCount = count;

                        selectedMccMnc = mccMnc;

        return mccString;

    }

    @Nullable

    private static String getNetworkMnc(CellInfo cellInfo) {

        String mccString = null;

        if (cellInfo instanceof CellInfoGsm) {