![]() ![]() Why did BT want to switch to a less secure system? I notice the prison payphones never made the switch. Yet even before 1995, smart cards used for viewing satellite TV had already been 'hacked'. The trial was successful and the new chip cards and payphones (made by Schlumberger) were rolled out nationwide, eventually replacing the Landis & Gyr optical cardphones. But in 1995, BT started trialling smartcard phonecards (chip-based) first in Portsmouth and the Isle of Wight. Thus cards could not be re-credited it was pretty much fraud-proof. A strip containing a hologram was scanned by a laser in the payphone, which burnt away the strip as the credit was used. I'm not sure what was different about them.Īnother oddity: When BT first introduced phonecards in the 1980s, they were optical. They were modified so that ordinary public phone cards could not be smuggled in and used in prison payphones. There's an article about BT Prison Phonecards here: ![]()
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