Well, I have a cheap phone plan that does not have unlimited data. I only pay for what I use there, and it's 10/per gig. Most of the time I'm on wi-fi, whether it's at home or at work, so I don't really need to have a big data plan. I just need mobile data to stream music and navigation whilst driving. I like the unlimited data thru Onstar because I already have another package, so the unlimited data add on is only 15 bucks a month. Better deal in my situation. So I'd like to be able to just use the data from my truck wirelessly if possible, but if not, plugging it in will work It just defeats the purpose of having wireless android auto. Thanks for the input.