Why is the numberpad on calculators or keyboards are different than the numberpad of the phones. since an avarage human dials mmore numbers than he uses a calculator why it is ordered in a strange fashion?

A friend of mine told me that in accounting numbers 0-1-2-3- and 5 are used very frequently and in order to acess these numbers real quick the calculator is designed that way but i am not sure his explanation is right.