Subject: Why is there no standardisation in the arrangement of numeric keys?

In a computer keyboard, the numeric keys in the keypad are arranged from 
bottom up whereas in a telephone instrument, the order is reversed except 
for the zero key. When you switch between a computer and a telephone for 
dialling telephone numbers you make mistakes on account of this difference. 
While computers and telephones are getting closer, how come there is no 
standardisation in the arrangement of the numeric keys?

Re: Why is there no standardisation in the arrangement of numeric keys?