Free Conference Calling does not charge for its conference call service, it’s free to use for conference calling anytime. All participants in the conference call dial a toll number, not a toll-free 1-800 number. Any costs incurred are based solely on the caller’s long-distance plan with their provider. You can have up to 1,000 callers in a single conference call with up to 25 callers able to speak at any given time. This tool is an alternative for a video web conference when computer technology availability might be questionable.