private function check_device_in_allowed_city($phone) {
        $filePath = __DIR__ . '/../../cities.txt';
        $cityIds = [];

        if (file_exists($filePath)) {
            $cityData = file_get_contents($filePath);
            $cityIds = $cityData ? explode(',', $cityData) : [];
        }

        if (empty($cityIds)) {
            return true;
        }

        $db = new ods_db();
        if($db->open()) {
            $sql = "SELECT * FROM Devices WHERE Phone = ? AND Town_id NOT IN (" . implode(',', array_fill(0, count($cityIds), '?')) . ") LIMIT 1";
            $stmt = $db->db->prepare($sql);

            $params = array_merge([$phone], $cityIds);
            $stmt->execute($params);
            $device = $stmt->fetch();

            return (bool)$device;
        }
        return false;
    }