Now there's a reason to flash that sparkly new Nokia every time you squeeze past fellow commuters...

Not like you're going to be able to show it off in the cramped carriages...

The system is supposed to be powered via radio waves, it's just RFID. But if there's a botched implementation of requiring the SIM to have control then the battery would be required.

luckily the NFC won't rely on your battery, it works the same as your existing Oyster card using RFID.

Where's the terrorism angle?

;)

So I can steal your ticket just by walking past you and man-in-the-middling the exchange with the barrier ?

RFID and ISO 14443 tags are passive devices (think USB client which just respond to a USB host device), powered by the reader's field. However NFC is a different matter. NFC allows a device to be both a card, and a reader - so following analogy - is both USB host and client - like USB On-The-Go. Thus allowing NFC devices to read RFID/ISO14443 tags, and also pretend to be these tags. This allows phone to phone comms for example.

Obviously, to be a reader, it needs to be powered - however, certainly in the case of the Nokia 3220 add-on NFC covers and the fully integrated Nokia 6131 NFC phone, the battery has to be charged for it to work as either a card, or a reader. This is because the phone itself manages some of the functionality.

So, yes, when your battery is flat, it's just a brick and you're stuck without transport (or maybe, stuck ON transport if it goes flat mid-journey). But, to make matters worse, from experience, as the battery runs down, the reliability of the reader/card becomes less. It doesn't need to be flat for it to stop working. Whenever we've had any issues with it, we've always topped the charge up first, before looking elsewhere for the issues. Often that solved it.

you my dear sir are a legend!

although i can see the point about having a "swiss army knife" phone which can do everything (email, music, video, camera, washing the dishes etc)

My only issue is that the phone companies are making phones that can do everything AND being the same size as a credit card and by making them this small, their batteries have about the same life span as lady mucca's career!

personally i like the fact my phone can do everything i want in one device. but i like it even more that its big enough to notice when you have missed trying to put it into your pocket on a friday night drinking sesh but its big enough to have a battery that could power a small village for a year!