Can toll free numbers really help in telemarketing? While the benefit of 800 numbers may not be immediately clear, they definitely can be a positive addition to your marketing. Your choices aren't limited to the “reserved” toll free numbers in the provider’s pool. You can also take advantage of a custom vanity number that better represents your business. The main advantage of choosing a number from the provider’s list is that these numbers already exist in the system, so they are quick and easy to set up, but some extra time may be worthwhile to select a vanity toll free number customers will easily remember.