public function getAnyPhoneNumber()
    {
        $phoneNo    = null;
        $numbersRaw = $this->getFlexiData($this->getApiURL(),
            ['detail' => 'custom:id,mobil,tel,kontakty(primarni,mobil,tel)', 'relations' => 'kontakty']);
        if (is_array($numbersRaw) && !empty($numbersRaw[0])) {
            $numbers = $numbersRaw[0];
            if (array_key_exists('mobil', $numbers) && strlen(trim($numbers['mobil']))) {
                $phoneNo = $numbers['mobil'];
            }
            if (array_key_exists('tel', $numbers) && strlen(trim($numbers['tel']))) {
                $phoneNo = $numbers['tel'];
            }
            if (array_key_exists('kontakty', $numbers) && !empty($numbers['kontakty'])) {
                foreach ($numbers['kontakty'] as $kontakt) {
                    if ($kontakt['primarni'] == 'true') {
                        
                    }
                    if (strlen(trim($kontakt['mobil']))) {
                        $phoneNo = $kontakt['mobil'];
                        break;
                    } elseif (strlen(trim($kontakt['mobil']))) {
                        $phoneNo = $kontakt['mobil'];
                        break;
                    }
                }
            }
        }
        return $phoneNo;
    }