The Bolt EUV's (& Many Other Cars') Secret Cell Phone Super-Antenna

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The Bolt EUV's (& Many Other Cars') Secret Cell Phone Super-Antenna
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A couple months ago, I found out that a seemingly pointless On* feature can actually be extremely useful.

On a trip to the Chiricahua Mountains of Arizona , I found myself looking for food. The local café had closed earlier than I thought, and we were pretty far south of I-10. So, we needed to look and see if we could find any nearby restaurants or break out the rations. But, even Verizon’s great cellular service wasn’t working, so we couldn’t access Google Maps to check restaurant hours or even call them.

Since then, I’ve used the feature several times on rural drives. Once, I was in an area that technically should have some cell signal, but I was between two small hills with enough vegetation to block a handheld cellular signal. Worse, I was stuck in deep sand that I had unexpectedly run into. As with the last time, I disabled Android Auto, connected to the hotspot, and was able to get pulled out.

A car is actually a kind of Faraday cage, or basically a steel cage. With all of the metal around you, it can be very hard for radio signals to get in and out of the car. So, when you’re at the edge of normal cellular coverage or in a low spot, a phone inside the car will lose signal. The Bolt EUV’s small sharkfin antenna probably isn’t the greatest, and it may be possible to upgrade it for a longer “whip” antenna of some kind. But, that’s probably only going to shrink the dead zones a little around the edges. Cellular signals can’t penetrate mountains or go over them, no matter how much power or how good the antenna is.

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