The total cost of each call placed by a subscriber of a Mobile Network Operator (MNO) is split in two parts.
The second part is the mobile termination rates (MTRs) that the provider of the call-receiver demands to deliver a call.
Initially this approach sounds fair, especially in the scope of the callee payment for the call receiving service, while he is mobile and not located in his home network.
The RPP principle may add an extra degree of freedom in the mobile call charges, since the termination rate is not a part of the total cost that the caller has to pay.
However, it is also adding a considerably big overhead for consumers such as the provider selection decision, while considering the callee role.