Call forwarding whilst roaming

[Ties Brants]

As far as I understood it some years ago:

If you do a direct (unconditional) divert to an other number you will always be billed as if you were in your home country. This because the network doesn't even have to know where you are and it doesn't have to send the call there.

When you do a conditional divert the call will first go to the roaming network and only when you don't answer/ are busy/etc it will go to the number you specified. But then the call has been on the roaming network so you pay roaming fees.
But if you switch your phone of your phone should notify the network and the roaming network should notify your home network that your phone is off. Then also, the network does not have to send the call to the roaming network, because it already knows your phone is off. So you should be billed as if you were home.

That is what I red somewhere a long time ago. So not sure if it is (still) true.
But to me it sounds logical.

I don't think the location/network where you set up the divert makes any difference. It is more about the way the call has to travel.

[DRNewcomb]

Originally Posted by Ties Brants

But if you switch your phone of your phone should notify the network and the roaming network should notify your home network that your phone is off. Then also, the network does not have to send the call to the roaming network, because it already knows your phone is off. So you should be billed as if you were home.

The problem is that greedy carriers lie and don't inform your home network when you turn your phone off, switch roamed networks or go out of service. They want your call to be forwarded to their network so they can make free money by forwarding it back to your network. This is why you should never trust conditional diverts while roaming.