ˌtoll-ˈfree adverb American English if you telephone a particular number toll-free, you do not have to pay for the call
—toll-free adjective:
a toll-free number [TahlilGaran] Dictionary of Contemporary English ▲
toll free adv. phr. Calling an (800) telephone number with the call paid by the business whose number one has dialed.
You can call us day and night, seven days a week, toll free. [TahlilGaran] English Idioms Dictionary ▲