Hi Anthony,

>
> Errr, ok :P
>
> How do you known this ? I looked on AT documentation for my modem, on
> 3GPP TS 27.007 V3.13.0, I saw nothing...

You really do not want to know.  But if you do, see 3GPP 51.011 or ETSI 
102.221 for details.

>
> I added some logs and each time ofono does AT+CRSM commands, there a
> call to "sim_fs_op_error" function ...
>
> I've got two kind of answers on AT+CRSM commands :
>
>
> ofonod[12357]: Data: < \r\n+CRSM: 106,130,""\r\n\r\nOK\r\n

I'm guessing you have a 3G sim.  Refer to 'Table 10.14: Status byte 
coding - wrong parameters' in ETSI 102.221.  Literally 106 means '6A', 
130 means '82' -> File Not Found.

>
> or
>
> ofonod[6859]: Data: < \r\n+CRSM: 144,0,""\r\n\r\nOK\r\n
>
> It means all the CRSM commands fails ???
>

Actually, this is peculiar, the CRSM command is not failing and the 
result is fine.  Just that it is empty.  Perhaps you need to quirk the 
CRSM behavior in this case.  Does adding your modem to the list in 
at_sim_read_info()

                 /* Maximum possible length */
                 len += sprintf(buf + len, ",0,0,255");
                 break;

make it work properly?

Regards,
-Denis