> brilliant if your family and friends are all on iPhones, which I'm pretty sure is fairly common in most Western countries
iOS market share is 60% in the US which is the highest worldwide, and only above 50% in a handful of other countries (UK, Japan, Oz, Canada)[0]. If you have any friends who are not rich, or are European or South American, there's a good chance they won't iMessage you but try to add you on WhatsApp.