M-GO's pay-as-you-go streaming service helps people find, rent, buy and enjoy digital entertainment on the devices they use and choose - TVs, iPads, tablets, Blu-ray players, streaming players, Macs, PCs and soon game consoles and smartphones.

ENGADGET: M-GO video on-demand movie service launches, streams to PCs, Samsung and Vizio players

Many European governments do not bother with a formal fund but use pay-as-you-go schemes, funding benefits out of future taxes.

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She said she was having to use pay-as-you-go sim cards in old handsets in order to stay in touch with her ex-husband to arrange access for her children.

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People will be able to use the pay-as-you-go cards, also available at TfL information centres, straightaway.

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TfL said the majority of 6.4 million passengers a day use travelcards or pay-as-you-go Oyster cards, as they offer cheaper fares.

BBC: London bus ticket vending machines may go from 2013