 Both produce a 32-bit pseudo-UIMID (pUIMID) with 0x80 in the upper 8 bits and the least significant 24 bits of the SHA-1 hash of the entire SF_EUIMID or the entire ICCID EF (for LF_EUIMID) in the lower 24 bits.The EUIMID (and UIMID) are hardware identifiers that do not change throughout the life of the card they identify.Their most important characteristic is that they are globally unique, no two R-UIM or CSIM cards should ever be given the same number.