Shame it doesn't work underground
In the E for Effort department, I have to say that this service – which I’m sure means well – should get some sort of stupidity alert. Instead of bringing fast relief this poster is only likely to cause already stressed commuters to go into a fit of rage when they see the poster underground and realise they’re trapped and can’t use it. Sure some underground systems have mobile internet/wifi connectivity but London’s ancient and creaking system sure doesn’t.
Unsurprisingly, it looks like TFL have been planning to install mobile connectivity since 2005 – 4 years later, there’s no sign though. Slow and crappy as ever.
I wonder what would have happened if people used it this morning when nearly the whole system was shut for snow…
Jason DaPonte's blog 
To be fair to the tube network, over half of the tube lines run above ground where you *can* get a mobile signal. Still doesn’t make any sense to mount the posters below ground, of course…