I seriously don't think unlimited calling is going to make anyone switch networks simply because people are more moving toward social media (aka WhatsApp) for communication. I would say at least 90% of mobile users below age 30 use WhatsApp for about 95% of their communication today. I never finish my minutes that come with activating service because i hardly ever need to dial someones number. Even when i was in America almost all my calls sent and received were over FaceTime or WhatsApp.
MSI B350 Tomhawk | Ryzen 7 5700x | Cooler master hyper 212 evo heatsink | MSI gtx 1070 | Corsair 32gb DDR4 (3200Mhz) | Samsung 970 evo 1tb | Seagate 1tb + 500 gb | Dell 27 INCH-S2719DGF 2560x1440 144hz Monitor