That's a great question, and it's a common point of confusion. The main difference between the various toll-free prefixes like 800, 888, and 866 these days often comes down to availability and perception, since they all function the same way for callers. The key is finding a number that's easy to remember and fits your brand. I found a really comprehensive resource that breaks down everything you need to know, from the history of these codes to how to choose the best one for your specific needs. It covers all the pros and cons in one place. I'd recommend checking out this detailed guide to get the full picture.