Question: What is the implication of having a '1' in a bit position within the Investigation Scan Flags of the EFInvScan (Investigation Scan) file for a Universal Subscriber Identity Module (USIM)?
Option 1: The USIM will prioritize voice services over data services for the corresponding Public Land Mobile Network (PLMN).
Option 2: An investigation scan shall be performed for the condition corresponding to that bit position, specifically for higher prioritized PLMNs not offering voice services.
Option 3: The USIM will disable scanning for available networks when roaming internationally.
Option 4: A '1' in any bit position indicates that the EFInvScan file is not present and thus no investigation scan shall be performed.
Explanation: According to the specifications, a '1' in a bit position within the Investigation Scan Flags of the EFInvScan file signifies that an investigation scan should indeed be conducted. This scan is specifically for conditions related to higher prioritized PLMNs (Public Land Mobile Networks) that do not offer voice services, ensuring the USIM can explore alternative network options for service availability.