Devices, methods, and systems for determining mobile network policy novelty are disclosed. One method 700 includes accessing 702 a first policy, a first policy identifier and a novelty parameter associated with the first mobile network. The method 700 includes determining 704 whether the first policy is new based on the novelty parameter. The method 700 includes sending 706 a registration message to the second mobile network. This registration message includes the first policy identifier in response to the determination that the first policy is not new.
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