Trying to use simtrace with 4FF NFC/SIM cards

Pedro Cabrera pedrocab at
Thu Mar 2 20:30:01 UTC 2017

Before proceed with oscilloscope, I do a last test using simtrace and a
Samsung Galaxy S3 with this UICC and surprisingly it works, so I have the
ATR APDU:  3b 9f 96 c0 0a 3f c7 a0 80 31 e0 73 fe 21 1b 65 d0 01 74 0e a1
81 0f 9c

>From there; Fi=512, Di=32, Protocol T=0, class accepted by the card: A, B
and C (

After this, I test over and over again with the same UICC card and an
iPhone6 but never got ATR response, just got "ATR APDU: " and iPhone don't
recognize SIM card. SCR3310 reader never recognizes the card, always "Card
state: Card inserted, Unresponsive card" response.

I test simtrace/iPhone6 and SCR reader using same UICC type from other
operator with same results (but working with simtrace/S.Galaxy S3)


2017-03-01 13:16 GMT+01:00 Harald Welte <laforge at>:

> I think the best way to analyze this is to understand the exact voltage,
> clock rate and Fi/Di values your card is operating on on the working
> reader(s).  Most likely at least one of the parameters is different on
> the non-working readers.
> You should be able to figure all the related values out if you talk
> CCID directly to the USB device, or extend / "hack up" the ccid driver
> you're using.  Alternatively, an oscilloscopse should also be able to
> tell you related information.
> Regards,
>         Harald
> --
> - Harald Welte <laforge at>
> ============================================================
> ================
> "Privacy in residential applications is a desirable marketing option."
>                                                   (ETSI EN 300 175-7 Ch.
> A6)
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