>The public payphones in Sweden (almost all of them) use a smartcard.=
 There's a display on the phone which shows how many meter pulses you have=
 left on the card.
>Just before the decrement comes, there's a faint high-frequency tone beep=
 in the receiver. I think that the intention is that you should normally=
 not be able to hear that tone.
>I don't know if there's a similar beep on a normal subscribers line, or if=
 it works in the same way abroad. But, maybe, you will get some ideas.

        BTW Attila, Do you live in sweden? I'd like to put my hands on some of=
 these used smartcards, I'd like to fiddle with it a bit ;o)


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Alexandre Souza
taito@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

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