sim900 works at at commnad but sim800 doesn’t work at at commnad

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    zsj

    hi
    I have two GSM modem with sim900 and sim800c module.
    I installed an applet on the SIM card when inserting it into the sim900 modem and sending the at command At + csim = 42,”00a4040010AID”. The applet is easily selected and will answer.
    But when I put the same SIM card in the sim800c modem and sending the at command At + csim = 42,”00a4040010AID”. just reply: +CME ERROR: unknown

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