said by FFH5:
I don't get the logic of a USB modem only $20/mo where the user can more easily use a lot of data. And a smartphone at $40/mo where less data would be used.
That pricing provides the biggest revenue and is a deterrent for abuse ('bud-share-a-line'), and is in-line with what big T and VZ charge for adding smartphones to a plan. Charging by the bucket takes care of any scaling modem usage.