Goggle hangouts now handle SMS and works quite well. Especially since all messages are archived on Google drive (or somewhere on Google cloud).
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I recently switched to using Google hangouts, and one of my favorite aspects to this is it works across all my devices (2 cell phones, a couple tablets, PC, laptop, etc.) very easily and my SMS messages are equally and immediately available no matter what device I'm using, which can be very helpful. I no longer have to tell my friends WHICH of my 2 cell numbers to text, or to send me an e-mail instead because I happen to be using my PC.