Really? While I personally don't need to work with phone numbers for my job, I found this list to be incredibly interesting. For many, this type of knowledge is

Really? While I personally don't need to work with phone numbers for my job, I found this list to be incredibly interesting. For many, this type of knowledge is often attained by making incorrect assumptions in your code/system design and having them proven wrong over time. Having a list like this which lays it all out for you in one shot is amazing.