WhatsApp calls
My plan includes unlimited data (and messaging) out of the country. I called T-Mobile to ask a couple of questions about using the phone while out of the country, and the Tech Support agent told me not to make WhatsApp (or Facetime) calls because they count as calls and are charged at the rate of $0.25/min. I argues that WhatsApp calls consume data, not voice minutes, but he still said I will be charged if I make WhatsApp calls if not connected to wifi. Is he right?