My Jag (in the UK) had a sim card phone that worked through the music system with a mic above the driver's seat and an "answer button" on the steering wheel. It was no more distraction than talking to a passenger, in fact it was easier to shut up them up!
The car my missus uses (in Bangkok) has the "blackout windows" like most cars in Thailand, so how are the police going to know what is going on inside?