src/User/Model/User.php
protected function getMobile(UserEntity $user) 
	{
		$metadata = $user->getMetadata();
		foreach($metadata as $meta) {
			if('cellulare' == $meta->getKey()) {
				return $meta->getValue();
			}
		}
		
		return null;
	}
protected function getMobile(UserEntity $user) 
	{
		$metadata = $user->getMetadata();
		foreach($metadata as $meta) {
			if('cellulare' == $meta->getKey()) {
				return $meta->getValue();
			}
		}
		
		return null;
	}
Return mobile meta value

@param UserEntity $user
@return string|NULL