Running data through your onboard modem, will in fact, truncate your data transmission speeds. It’s a 4g device. Everything is much faster, running data direct from my 5g phone. It’s the primary reason that I canceled my ford data subscription. The modem is outdated by 5 + years. Everything I need, including remote start and unlock, works fine without the ford data subscriptionI’ve had all sorts of cell phone carriers in my truck. The onboard modem has 0 effect on the phone service or signal based on carrier
Now, if you try to use WiFi calling with the built-in hot spot on the Bronco - all your calls would get routed via the on board modem. But that’s a pretty specific use case there, and again, it wouldn’t matter what carrier your phone is on.
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