You can make it a video call, or invite other friends in. Even when the called person is on android. I'm not sure if that would work with regular call. (iOS to iOS probably has this already, I don't know)

Also you are connected via wifi, it's free. Even when you are in another country.

For a long long time I had a prepaid sim, and would just call my out of country family on whatsApp / Signal from home. Basically did not pay anything for it.