Bringgo has a list of compatible phones for North America at
http://www.bringgo.com/_file/NAM.pdf. Their website says "The vast majority of Android devices running O.S. 2.3 or later." Their "vast majority list" includes 16 Android phones, including those big sellers, the Samsung Rugby Smart (ever heard of that one?), the Kyocera Echo and the Motorola Cliq 2 . They list 3 iPhones as well, but it seems like they can't make it work for iPhone users to purchase Bringgo, so it's useless there.
The only Galaxy S3 on the list is the GSM version, so no Spring or Verizon. Kind of amazing that this big Chevy p.r. push doesn't work on most of the best selling smartphones in the U.S. (No Galaxy Note II either.) The list is a joke. Of the 16 Android phones on the list, 13 were released back in 2011. Only 3 are newer, and one of those, the Galaxy S3, doesn't work in its Verizon (and likely Sprint) version.
So it looks like Bringgo hasn't been doing squat to test compatibility and update that list, even though in their canned email to me they wrote "We will review the list of supported phones periodically to ensure that the app supports the widest range of phones possible. It is not possible to support certain phones due to limitations with the hardware itself or the interfaces used."
Given that really outdated list, don't hold your breath that any of us with newer phones not on that list will be getting Bringgo anytime soon. Chevy should maybe change its marketing to "Hey, if you have an old smartphone that you're thinking of trading, don't. Give it new life, buy an $18,000 Sonic and you'll see it do tricks you never thought it could do."
Somebody at Chevy sure dropped the ball on this one. Maybe they should go on eBay and buy up all of those "end of life" phones and give one free with every Sonic or Spark purchase.
Engis is looking like a company that's really just a few programmers in an office in Seoul that's in way over their heads.