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FWIW, the box couples the phone to the antenna on the roof to improve signal strength and optimize your cellular connection, so it's not a bad thing to use, but your phone needs to be in the tray...not just in the vehicle.
If you drive in areas where the cellular connection may be spotty, and you're not using it, you might find you can keep your connection through those spots if you do. Others, may never notice any difference.
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