True 800 numbers might be the most desired tracking numbers, but they often come with a price. First, they might be difficult to acquire. Many of the desirable vanities are taken, and if available, they likely come at a premium cost. Second, since all 800’s have been in circulation longer than other prefixes, there is a stronger chance for misdials.
Naturally, when dialing an 888, 877, 866, 855, or 844 number, some callers are inclined to dial 800. Assuming the same 7 digit number is in use for all 6 prefixes, there is the possibility that someone calling one of the other 5 will mistakenly dial 800. This scenario is in addition to other chances for misdials, such as fat-fingering and transposing numbers, that plague all phone numbers.