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	<title>Mumyls Blog &#187; Phone</title>
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	<description>Catatan Harianku</description>
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		<title>How BT Phone Cards Work</title>
		<link>http://www.mumyls.web.id/2009/04/how-bt-phone-cards-work/</link>
		<comments>http://www.mumyls.web.id/2009/04/how-bt-phone-cards-work/#comments</comments>
		<pubDate>Tue, 07 Apr 2009 02:32:44 +0000</pubDate>
		<dc:creator>Mumyls</dc:creator>
				<category><![CDATA[Phone]]></category>
		<category><![CDATA[bt]]></category>
		<category><![CDATA[card]]></category>
		<category><![CDATA[work]]></category>

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		<description><![CDATA[Today, I’ve found this articles from my old documentation. I hope it useful. Contrary to popular belief, BT phone cards 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 phone card &#8211; preferably a used one if you are going to scratch it or dissect it. If you look on the printed surface (the green  side &#8211; which is the front) you will find two lines which form a thick band.  Underneath this area is a &#8220;track&#8221; which holds the information about the  number of units used up and how many are left. A used phone card will have  some tiny bars marked on the track near one end. On the reverse side of the phone card (the black side) you can see a shiny black strip in contrast to the matt black which has text on it (on older phone cards the whole of this side is shiny black). Anyway, this shiny strip is &#8220;opposite&#8221; the band on the front and acts as a &#8220;window&#8221; to the information on the track &#8211; for the simple reason that it [...]]]></description>
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