What do you mean by free calls and free text messages from Dentsu?

Hello, landlord, free phone call means that both parties can talk freely through software. As for free SMS, there is no free SMS at present. Many businesses use the banner of free to attract consumers' attention. If it is free, how does their company operate? If the landlord needs to know more free telephone numbers, you can express them in official website, and their customer service will give you detailed answers. Now many hospitals and schools all over the country are using their products, hoping to help the landlord.