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End of an era: T-Mobile finally closes the door on 2G for good
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
You can get an updated modem from Nissan if you wanted. My boss did that, but I don't remember the cost.
The Android Auto still works, but to be completely and embarassingly honest, I have had a car with bluetooth for ten years and I think I have only used it once. I'm just weird like that. I just put some tunes on a USB and its good enough.