For Android users who either have Android 4.4 KitKat or have upgraded to Android 4.4 KitKat, you might recall that one of the changes Google made included consolidating both SMS and Google Hangout chats in a single Hangouts app. This is fine since Apple did the same for its Messages app which allows both iMessage and SMS sending. However one of the criticisms was that it was hard to differentiate between a Hangout message and an SMS, although to encourage more users to switch to the Hangouts app, Google introduced a feature called SMS for Hangouts, which was basically a way for Google to forward Hangout messages to users via SMS, in the event that the user did not have data.