The present disclosure describes methods for applying policies that govern selection and use of radio-access networks by a wireless device. A device receives a first set of parameters for evaluating networks from a first network element and receives a policy from a second network element. The policy includes a second set of parameters and a preference indicator to indicate whether the first set or the second set is a preferred source of parameters to be used when evaluating networks. The device determines, based on the indicator, whether a corresponding parameter in the first set should be used in place of a parameter in the second set when applying the policy. If it is determined that a corresponding parameter in the first set should be used, the device uses the corresponding parameter in the first set when applying the policy to evaluate the networks.