valid phone number / kiểm tra số điện thoại

ValidPhoneNumber = function (val) {
    val = val.replace(/-/g, '');
    if (val == '' || val.length < 10 || val.length > 11) {
        return false;
    }
    var strCheck = '';
    if (val.length == 11) {
        strCheck = val.substr(0, 4);
    }
    else {
        strCheck = val.substr(0, 3);
    }
    if (strCheck == '099'
        || strCheck == '0199'
        || strCheck == '091'
        || strCheck == '094'
        || strCheck == '0123'
        || strCheck == '0125'
        || strCheck == '0127'
        || strCheck == '0129'
        || strCheck == '0124'
        || strCheck == '095'
        || strCheck == '092'
        || strCheck == '0188'
        || strCheck == '0186'
        || strCheck == '097'
        || strCheck == '098'
        || strCheck == '096'
        || strCheck == '0162'
        || strCheck == '0163'
        || strCheck == '0164'
        || strCheck == '0165'
        || strCheck == '0166'
        || strCheck == '0167'
        || strCheck == '0168'
        || strCheck == '0169'
        || strCheck == '0197'
        || strCheck == '0198'
        || strCheck == '090'
        || strCheck == '093'
        || strCheck == '0122'
        || strCheck == '0126'
        || strCheck == '0121'
        || strCheck == '0128'
        || strCheck == '0120') {
        return true;
    }

    return false;
}