To stress the benefit of unlimited international calls, I recently got parents on a 'senior' plan with unlimited text/data. The catch though was $3/minute international calls even when the call is placed while on a wifi connection - their bill essentially doubled after a couple accidental international calls.
Can see the benefit of Fi for people that have to do international calls regularly and don't want to futz with switching between their cellphone and a voip service.
I switched my mom's flip phone to a smartphone and just call home with whatsapp. I was worried about the transition but she was the one asking for it since all my aunts and uncles are on whatsapp as well. All the international calling with calling cards and whatnot have all gone.
Can see the benefit of Fi for people that have to do international calls regularly and don't want to futz with switching between their cellphone and a voip service.