Question: In a USIM application, what is the purpose of the EFCFIS (Call Forwarding Indication Status) file in relation to Multiple Subscriber Profiles (MSP), as per 3GPP specifications?
Option 1: To store the entire call forwarding configuration for all subscriber profiles.
Option 2: To determine whether to display Call Forwarding indicators on the ME's display after re-activation, with separate records for each of up to 4 subscriber profiles.
Option 3: To manage service availability (e.g., Service n°49) across different MSPs.
Option 4: To encode CFU indicator statuses in a format compatible with TS 22.030 for all UE types.
Explanation: The correct answer, Option 2, highlights the EFCFIS file's role in managing Call Forwarding indicators for multiple subscriber profiles (up to 4, as defined by MSP specifications). This aligns with the detailed function of EFCFIS in determining indicator display post-re-activation on the Mobile Equipment (ME), tailored to each subscriber profile. The other options either overstate the file's scope, misinterpret its application, or confuse its purpose with encoding formats.