On Mon, Aug 20, 2012 at 09:40:23PM +0100, Paul Corfield wrote:

Wi-fi would need to be completely free and available everywhere on the
network before you could contemplate using a phone.

Or use 3G/EDGE/GPRS. You need to figure out your route before going to
the platform anyway - after all, if you don't do that, you won't know
which station to start at or which line you want. And you might find
that you're better taking a bus.

Provided that you sort it out in advance with your cellco it need not be
expensive even when you're abroad.

--
David Cantrell | Hero of the Information Age

One person can change the world, but most of the time they shouldn't
-- Marge Simpson