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Actually, it depends on the app. Remember, cell phones all have wi-fi. And you can set up a wireless wi-fi modem (whether or not it's connected to the Internet or cell service). So many two-way communication apps can still function in a wi-fi-only environment. Given the number of devices...

We run PCI ICs/radios in my offroad cars. But as with the offerings from Rugged Radio, they are pricey. I will echo the suggestion of using an aviation intercom (often they can be had for half the cost of a name brand offroad intercom) as I have known several drivers who have used them for...