smartcard - 4G module returns CME ERROR:15 when I opend my own applet in the SIM card with AT+CCHO command

Question

everyone, I'm developing a project with LTE 4G module and having a problem described as following:

1. I write a SIM card application (with Java tech) and download it into the SIM Card.
2. After downloading the applet, inert the SIM card into a card reader, then I can send APDUs to the applet through this card reader. applet works fine ,it accepts the APDU and gives the response back.
3. After finishing the APDU test , I insert the SIM card to the LTE 4G module ,and send AT+CCHO="A0BB01020304050001"(A0BB01020304050001 is my applet DF name) through uart to open the applet, the 4G module returns +CME ERROR: 15(SIM Wrong).But some other original applet(such as USIM) in the card can be opend normally in this way.

so,does anyone know whether there are some key points I have to pay attention to my applet or the AT+CCHO command? I'll be very appreciated and willing to give what all I have.

Answer 1

等待大神答复