LOCI
Definition
Location Information file (EF_LOCI on SIM, EF_LOCI and EF_EPSLOCI on USIM). Stores the Location Area Identity (LAI) last received from the network during a location update procedure. The LAI contains Mobile Country Code, Mobile Network Code, and Location Area Code, mapping the card to a geographic zone served by a group of base stations.
- SIM file
- EF_LOCI
- USIM files
- EF_LOCI and EF_EPSLOCI
- Content
- Last received Location Area Identity (LAI)
- LAI components
- Mobile Country Code, Mobile Network Code, Location Area Code
Common questions
What investigative value does the LOCI file have?+
It can indicate the approximate zone where the SIM last registered with the network, giving investigative leads on the device's last known area even without pulling carrier records.
How precise is location data recovered from the LOCI file?+
Only zone-level, corresponding to the area served by a group of base stations, not GPS-level precision, so it locates the card to a region rather than an exact point.
Related terms
- APDU
- Application Protocol Data Unit. The command and response message format used to communicate with a smart card over the ISO 7816 interface....
- EF_SMS
- Elementary File for Short Message Service. A fixed-size record file on the SIM that stores SMS messages. Each record has a status...
- ICCID
- Integrated Circuit Card Identifier. The serial number of the physical SIM card itself, stored in EF_ICCID. It identifies the card as a...
- IMSI
- International Mobile Subscriber Identity. A 15-digit number stored in EF_IMSI on the SIM that uniquely identifies the subscriber account on the mobile...
- UICC
- Universal Integrated Circuit Card. The physical hardware platform for modern SIM cards. A UICC can host multiple card applications simultaneously: a SIM...