I have bad experience with Dudu7 with OS3.6 using SIM card. Every month the OS is taking up 1-1.5GB internet data per month. Using data applications, it cannot drill down to trace what is being used up by the OS which is very frustrating. When in data usage module, it will only show that the OS is taking up all the data utilization.
The car is used 4-5 times a week with total of 5-7 hours total drive a week. I am only using Android Auto nearly 99% of the time of the car use.