Patent ID: 11924915
Assignee: T-MOBILE USA, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A mobile device comprising:
a processor; and
memory storing:
one or more public land mobile network (PLMN) codes from a first list of equivalent PLMNs that the mobile device received from a first mobility management entity (MME) or a first access and mobility function (AMF) node, wherein the first list of equivalent PLMNs is associated with a home network; and
computer-executable instructions that, when executed by the processor, cause the mobile device to perform operations comprising:
sending a first message to a second MME or a second AMF node;
receiving, from the second MME or the second AMF node, a second message that includes a second list of equivalent PLMNs, wherein the second list of equivalent PLMNs is associated with a roaming network; and
after receiving the second message including the second list of equivalent PLMNs, maintaining the one or more PLMN codes of the first list of equivalent PLMNs in the memory.