So, today I let my Solavei account expire, and make the switch to straight talk. The interesting part is, the entire day I was without data or a wifi connection (after I cancelled Solavei and before I enabled Straight talk), But I was still able to send and receive text messages using the new Hangout SMS app. Keep in mind, the stock messenger would not work, and MMs still didn't work. I'm not complaining at all, but why was this possible? I had zero service and zero wifi. I couldn't make a phone call, browse the web, or send a text using the stock messenger. But, Hangouts app allowed me to send/receive text messages all day.