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I'd make sure you're in a place that gets a good cell signal. I'm not sure which carrier - I think it's AT&T.
I know some older units had to be replaced because the carrier didn't support the old protocol anymore, but I think that was in Canada and for older cars.
Ok, found the thread. Yes, Canada, but 2015 might be affected: http://www.cruzetalk.com/forum/36-gen1-audio-electronics/146321-onstar-2g-upgrade-4g.html
I know some older units had to be replaced because the carrier didn't support the old protocol anymore, but I think that was in Canada and for older cars.
Ok, found the thread. Yes, Canada, but 2015 might be affected: http://www.cruzetalk.com/forum/36-gen1-audio-electronics/146321-onstar-2g-upgrade-4g.html