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Old 05-26-2001, 17:07   #2 (permalink)
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Join Date: May 2001
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Found out how to do this, so if anyone else wants to know.....

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The test card is not any special by itself. All the functions are carried out by the phone software, but the card act as the key that unlock these functions. The test card is an ordinary SIM with a special entry in the 6FAD file. As soon as the phone discovers that the inserted SIM card has bit seven of the first byte in the 6FAD file set (this means every value from 81-FF), it will allow you to enter test mode by holding down "#" for three seconds. Ordinary SIM cards have the entry "00 FF FF" in this field, but the test SIM has "81 FF FF" - 81 is defined in the GSM TS 11.11 as used for "Type approval".
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