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$rootActivity = $this->GetRootActivity();
 
$iContact = $rootActivity->GetVariable("CID");
 if ( \Bitrix\Main\Loader::IncludeModule('crm') && !empty($iContact) ) 
{
    $arFilter = [
        'ENTITY_ID'  => 'CONTACT',
        'ELEMENT_ID' => $iContact,
        'TYPE_ID'    => 'PHONE',
        'VALUE_TYPE' => 'MOBILE',
    ];
    $resPhones = \CCrmFieldMulti::GetListEx([],$arFilter,false,['nTopCount'=>1],['VALUE']);
    $arPhone = $resPhones->fetch();

    if ( !empty($arPhone) )
    {
        $rootActivity->SetVariable("Var1", $arPhone['VALUE']);
    } 
}