I haven't called a "normal" phone call or used SMS/MMS in many many years. Everyone I know (or care about rather) uses Telegram, and it's been great for us all.
Messaging currently requires you and the people you are communicating with to agree on a platform. If all you use is Telegraph, then you are not communicating with those who don't.
at least where i live, whatsapp is the defacto messaging platform -- i don't know a single person that doesn't have it, to the point where people won't call you, they just assume you have it so they just send you a message.
