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Sometimes it was possible to find a nearby local exchange which when the caller dialed the local code, then added 0, he would get free STD access.

For those in the know, it was possible to modify the Post Office phone (preferably the 700 series) by fitting a suitable diode and push button.

Some typical tricks used between the 1950s and 1970s included: 9-1-11.

By dialing an exchange local to the caller's phone (preferably a call box phone), dialing 9-1-10 then at the right moment tapping the phone rest to add an extra pulse, this could give irregular STD (Subscriber Trunk Dialing) access.

It is notable that the two methods can be combined: Even if the exchange does not support DTMF, the key lock can be circumvented by switch-hooking, and the tone dialer can be then used to operate automated DTMF controlled services that can't be used with rotary dial.

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Depending on continent and country, one click with a following interval can be either "one" or "zero" and subsequent clicks before the interval are additively counted.It was also advisable to contact the recipient to ensure he was expecting the caller before making the call.Some other techniques were deliberately put in by exchange staff, the most popular being the use of an unused number.When the number was dialed the "number unobtainable" tone would be returned, but after a minutes or two it would clear and give STD access.Other techniques were used but the technicians involved always had to be wary of the Post Office Special Investigation Branch.

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