Read SIM in Binary

txt = modem.simrb(fileid, len)
txt = modem.simrb(fileid, addr, len)

Reads fileid, in binary, with optional offset addr from the SIM card.

Uses AT+CRSM=176,XXX,0,0,X to read from the SIM card.
Where AT+CRSM=176,fileid,addr.h,addr.l,len