Version 2.0 ofnow has SMS/MMS integration, as . It finally began rolling out to users on Thursday, and the feature adds convenience for people who use text messaging and Hangouts by unifying the two into a single app.
The first time you launch Hangouts after the update, you're prompted to enable SMS in Hangouts or try it later. If you opted to give SMS in Hangouts a try, but still prefer using separate apps, you can disable the SMS integration.
On devices running Android 4.3 or lower, disable SMS in Hangouts by going to Settings > SMS, then uncheck the box next to "Turn on SMS."
On devices running Android 4.4, go to Settings > SMS, then tap on "SMS Enabled" to change your default SMS app.
If you're using SMS for Hangouts, let us know what you think of it. And if you disabled, let us know why.