That's what we call "texting", but very often texting isn't done using SMS. With the iOS market share hovering slightly below 50% in the US, it's iMessage that

That's what we call "texting", but very often texting isn't done using SMS. With the iOS market share hovering slightly below 50% in the US, it's iMessage that is the main messenger, at least where I live. The iOS Messages app seamlessly switches over to SMS when the receiver doesn't have iMessage - and shows a visual distinction - but in my case, that's a minority of the people I text with. I don't use Whatsapp nor was I ever invited by someone to use it, but I heard it's basically the iMessage equivalent in the EU and in other places where the iOS market share is lower.