Perhaps because all the other carriers sell you X GB per month, so they want their plans to be easily comparable to the layman?
To you or I it is easy to see the true nature of their "plans" but to someone who isn't quite sure how many megabytes are in a gigabyte, this probably makes it a lot easier to compare to, say, AT&T.
To you or I it is easy to see the true nature of their "plans" but to someone who isn't quite sure how many megabytes are in a gigabyte, this probably makes it a lot easier to compare to, say, AT&T.