The Location Area Identifier (LAI) of the phone’s current location, continuously maintained on the (C/U)SIM when the phone is active and saved whenever the phone is turned off.
Source(s):
NIST SP 800-101 Rev. 1
the Location Area Identifier (LAI) of the phone’s current location, continuously maintained on the SIM when the phone is active and saved whenever the phone is turned off.
Source(s):
NISTIR 7250
under Location Information
NISTIR 7387
under Location Information