Black box insurance or smartphone tracking - which is better for your car policy?

https://reliabless.com/how-a-single-commute-rewrote-the-rules-of-business-van-insurance/

7 Key questions about black box versus app-based telematics and why they matter People asking about telematics usually want to know three things: will it cut my premium, will it invade my privacy, and will it actually reflect how I drive?