Which network component stores roaming subscriber data for devices currently in a visited network?

Which network component stores roaming subscriber data for devices currently in a visited network?

• A. HLR
• B. VLR
• C. HSS
• D. IMSI

Answer: (B)

When a device roams into another operator’s network, that visited network needs a temporary, local record of the subscriber so it can manage authentication, services, and routing without constantly checking the home network. This is provided by the Visitor Location Register, a database kept in the visited network specifically for subscribers currently there. It holds roaming subscriber data like identity, service profile, and brief authentication info so calls and sessions can be handled smoothly while the device is in the area. Once the subscriber leaves, the VLR data is cleared or updated as appropriate. The alternative stores are different roles: the home location register contains the permanent data for subscribers in their home network, the Home Subscriber Server serves similar purposes in LTE networks, and the IMSI is the subscriber’s identifier on the SIM, not a roaming data store.

When a device roams into another operator’s network, that visited network needs a temporary, local record of the subscriber so it can manage authentication, services, and routing without constantly checking the home network. This is provided by the Visitor Location Register, a database kept in the visited network specifically for subscribers currently there. It holds roaming subscriber data like identity, service profile, and brief authentication info so calls and sessions can be handled smoothly while the device is in the area. Once the subscriber leaves, the VLR data is cleared or updated as appropriate.

The alternative stores are different roles: the home location register contains the permanent data for subscribers in their home network, the Home Subscriber Server serves similar purposes in LTE networks, and the IMSI is the subscriber’s identifier on the SIM, not a roaming data store.