WhatsApp never caught on in the US since cell phones and SMS were a great deal for keeping in touch. By the time WhatsApp arrived US carriers were not raping their customers for phone calls or SMS messages (in the early days of cell phones they were - be very careful responding as the state of the world has changed many times over the years and so it is quite possible you remember a time where your country was better than the US for reasons that are no longer true!). Note in particular calls and SMS to a different state is included, and typically Canada is included as well. As such we never developed the WhatsApp habbit as it didn't give us anything.