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An interesting tidbit is that WhatsApp actually predates FaceTime and iMessage, and thus it was one of the earliest iPhone apps that allowed sending text messages over data as opposed to SMS. Interoperability with Android was a plus. I was tremendously pissed off when I moved from a BlackBerry (with blackberry messenger and “free over data” messaging) to an iPhone in 2008 and had to go back to paying per sms sent. Th…
I found it surprising at the time that instant messaging apps that originated on PCs (ICQ, AIM, Skype, etc...) did not get widely adopted for this role despite most of the well-known ones releasing iOS and Android versions at the time.
Microsoft really missed an opportunity, I remember using a third party app for Messenger and the mobile experience wasn't great. Skype was too focused on voice and video calls, not seen as an instant messaging app, even though it could very well have been.
The biggest fumble really comes from Google though. I was using Google Talk as my main messaging app on PC, and Android had pretty much everything ready before iOS, including video chat over 3G.
However Google went through a pointless revamp with Hangouts and never managed a convincing SMS integration.