4.2 Contents of files at the USIM ADF (Application DF) level

31.1023GPPCharacteristics of the Universal Subscriber Identity Module (USIM) applicationRelease 17TS

The Efs in the USIM ADF contain service and network related information.

The File Ids ‘6F1X’ (for Efs), ‘5F1X’ and ‘5F2X’ (for DFs) with X ranging from ‘0’ to ‘F’ are reserved under the USIM ADF for administrative use by the card issuer.