NETWORK TECH WORLD Subject: Re: fonecards Date: Thu, 14 Sep 95 18:04:28 GMT References: <DEwv47.Cv8@spuddy.mew.co.uk> <43blpt$9ke@columbia.acc.brad.ac.uk> Here Ya go: ---------START OF TEXT ----------- HOW BT PHONE CARDS WORK - Transcribed by Archaos - June '93 ----------------------- ---------------------- -------- Contrary to popular belief, BT phonecards do not work using a magnetic strip system. The reason for this being that a magnetic strip would be read only. So how do they work then? Well, examine a phonecard - preferably a used one if you are going to scratch it or dissect it. If you look on the printed surface (the green side - which is the front) you will find two lines which form a thick band. Underneath this area is a "track" which holds the information about the number of units used up and how many are left. A used phonecard will have some tiny bars marked on the track near one end. On the reverse side of the phoneca...
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