I don't know about America but I recently discovered that using any system not built into the car is illegal in the UK. The fact is that a lot of people use su

I don't know about America but I recently discovered that using any system not built into the car is illegal in the UK. The fact is that a lot of people use such a mount anyway, but they are technically breaking the law and can be sent fines (eg if spotted by a motorway/freeway automated camera system). It kind of makes sense. Devices built into a vehicle have to meet safety specifications and it can be proved that they have. There is no such reassurance on a dash mounted phone. It could easily switch mode and distract you and cause an accident.