When Apple originally announced iMessage I thought "why do we need another messaging platform??" We already had regular sms, FB Messenger, Whatsapp, Viber and so on and so on. Now I realize how smart it was to have a sms replacement exclusive to iPhone. Much like BB messenger 10 years ago, having an exclusive messenger really locks people into your OS. I use a Note 4 sometimes and the thing I miss the most is iMessage. Everyone in my family and most of my friends and coworkers use iMessage. When I use the Note it's like being on the outside looking in. SMS just isn't the same.