4 General description

22.0223GPPMobile functionality specificationPersonalisation of Mobile Equipment (ME)Release 17TS

The personalisation features work by storing information in the ME which limits the IMs with which it will operate, and by checking this information against the SIM/USIM whenever the ME is powered up or a SIM/USIM is inserted. If a check fails, the ME enters the "limited service state" in which only emergency calls can be attempted (see annex A.2).

There are five personalisation categories of varying granularity; network, network subset, SP, corporate and SIM/USIM. The personalisation categories are independent in so far as each category can be activated or de‑activated regardless of the status of the others. Each category has a separate personalisation indicator to show whether it is active or not. The ME can be personalised to one network, one network subset, one SP, one Corporate, one SIM/USIM or any combination thereof. The ME may optionally be personalised to multiple networks, network subsets, SPs, Corporates, IMs or any combinations thereof.

The codes used for each personalisation category are shown in Table 1. Some categories require several codes (e.g. SP and network for SP personalisation) and each combination of codes relating to a particular entity (network, SP etc.) is referred to as a code group. To personalise to multiple entities, multiple code groups are stored in the ME. For each activated personalisation category, the ME retrieves the relevant codes from the SIM/USIM and checks the retrieved code group against the (list of) code group(s) stored in the ME. If a match is found with any of the code groups stored in the ME, the check is passed for that category. If checks for all active categories are passed, then the MS goes into normal operation.

Table 1: Codes used by each personalisation category

Code	Network (MCC, MNC)	Network Subset (IMSI digits 6 and 7)	SP	Corporate	SIM/USIM (IMSI digits 8 to 15)
Personalisation category
Network	
Network subset		
SP			
Corporate				
SIM/USIM					

Precautions must be taken to ensure that when more than one personalisation category is to be activated or when the ME is to be personalised to more than one entity of a personalisation category, the new codes are not in conflict with any existing valid codes. To avoid such conflicts, checks are carried out by the ME during the personalisation cycle, as described in clause 13.

As an optional ME feature, the status (activated or not) of each personalisation category and the values of the relevant codes may be read by the user.