Question: What is the priority order for displaying a PLMN (Public Land Mobile Network) name on a User Equipment (UE), from highest to lowest, when multiple sources are available?
Option 1: USIM (Universal Subscriber Identity Module) > NITZ (Network Identity and Time Zone) > ME (Mobile Equipment)
Option 2: NITZ (Network Identity and Time Zone) > ME (Mobile Equipment) > USIM (Universal Subscriber Identity Module)
Option 3: ME (Mobile Equipment) > USIM (Universal Subscriber Identity Module) > NITZ (Network Identity and Time Zone)
Option 4: USIM (Universal Subscriber Identity Module) & NITZ (Network Identity and Time Zone) have equal priority, then ME (Mobile Equipment)
Explanation: According to telecom standards for PLMN indication, the UE prioritizes displaying the PLMN name based on its source. The highest priority is given to the PLMN name stored in the USIM, as it is directly associated with the subscriber's profile. The next priority is the PLMN name provided by NITZ, which overrides the ME's stored name for accuracy and timeliness. The lowest priority is the PLMN name stored in the ME, used when other sources are unavailable. This order ensures that the most relevant and up-to-date information is displayed to the user, enhancing their roaming experience.