SIM select file (A4) command

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Thomas Chen tchen61 at gmail.com
Tue Feb 20 19:58:43 UTC 2018


i noticed the GSM modem issued a couple SELECT (a4) commands that i 
cannot find the documentation for

would any one be able to help identify these ???

thanks



00 a4 00 04 02 7f ff

00 a4 00 04 02 7f 66


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