In message
, at
00:33:14 on Tue, 26 Oct 2010, MIG
remarked:

It leaves the question: why would it cost the mobile company more to
connect to one of these numbers than to connect to any other number?

It doesn't necessarily[1]. Phone calls are not priced on a cost-plus
basis.

[1] Although it probably does cost the mobile phone company more to
carry the call from a handset to the interconnection point, than it
would cost many landline operators. If "cost" takes everything into
account.
--
Roland Perry