Originally Posted by UncleMike
I'm pretty sure that the ability to send SMS while only on Wifi is a feature specific to Republic Wireless, and is a necessity because their service relies on Wifi as a fall back (or possibly primary) network. To confirm this, I just tried send an SMS (using Hangouts 2.0.303) with the phone radio disabled and it failed. And even if it were possible regardless of carrier, without carrier service you won't have a phone number, so how would calls/SMS work at all?
I'm only semi-familiar with how Republic Wireless works, but if you're ditching their service, I think you would be wise to ditch the phone too, and replace it with a traditional model that's not specific to Republic's hybrid network.
Since I obviously wasn't clear before, let me try again. I installed the latest version of Hangouts on my old TMobile (no longer has service) Samsung Galaxy Exhibit 4G. I then sent an SMS to another number, received it, and was able to respond. Hangouts also supports Voice (and video) calls over WiFi.
So you get everything RW offers direct from Google, but without the monthly fee.
As for the RW Moto X it is a Sprint phone for all intents and purposes, and is only limited in terms of the hybrid ROM it runs. Have successfully just finished doing the RootMyMoto and installing the SafeStrap app so I can boot into custom ROMs. Now just have to find one that works on the RW Moto X. I believe someone mentioned you could use one of TMobile's 4.4 ROMs, but I will need to track down which one.