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Driving a 2015 Volt since new.

Last year or the year before I lost my car phone; I believe I was told it was because "3G" was being phased out. I was sad.

Now in 2022 I'm reading that On*Star itself will disable at the end of the year, because "2G" is being phased out. I am sad.

Isn't the WiFi hotspot on 4G? So I'm not losing that?

That leaves my remote application which I definitely use to start and unlock the car. What radio system does the myChevrolet app use?

I am sad. And confused. (If you're a Trekkie, think pakleds)
 

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On star has one cell phone on board, but it likely has a chip that allows it to work with multiple bands like 2G and 3G. I don’t know whether it supports 4G or not, but I don’t even maintain my onstar account anymore anyway. My 5g iPhone works just fine and I’m willing to give up remote start and use my key fob
 

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Your 2015 has 4G LTE connectivity for OnStar, WiFi hotspot, and in-car calling. They wanted to sell me in-car calling last year, but I had to use the minutes within 3 months and they wouldn’t roll over when renewing. So it’s a crappy deal, but it’s not discontinued except on new vehicles.
 
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