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Mozilla review of 25 car brands finds they're "a privacy nightmare"
(foundation.mozilla.org)
This is a most excellent place for technology news and articles.
I did use Onstar, but when my 2013 Volt went offline because of the 3g network sunset, I lost that functionality. Would have loved the ability to upgrade the cellular module in my car so I could have the security and safety features back, but one silver lining is disconnecting :) Of course, GM was going to quietly continue charging me for the same service after the connection died, but I canceled.