There are several synonyms that can be used for the term "toll free calls." These include free phone calls, toll-free numbers, toll-free lines, 800 numbers, free call services, and free calling systems. These terms are used to describe a telephone service where the calling party is not charged for the call, instead, the receiver bears the cost of the call. This service is commonly used by businesses to provide customers with an option to contact them without any cost. It helps in improving customer support and engagement. So, whether you use toll-free numbers or free phone calls, the basic idea is to provide your customers with the convenience of reaching out to you at no cost.