A method of improving efficiency in a first communications network based on a metric on a relation between a first operator (A) of the first communications network and a second operator (B) of a second communications network, the method comprising a network device of the first communications network:
- providing, to a network entity, data relating to users having a subscription with the first operator;
- receiving, from the network entity:
- a first metric (IAB) giving number of users roaming to the first operator from the second operator;
- and
- a second metric (OAB) giving number of users roaming from the first operator to the second operator;
- and
- adapting, based on the received first and second metrics, at least one parameter in the first communications network.