The main unit operating system is unstable and often malfunctions. I often had to reboot the system to get it working properly again. It would hang during a phone call and mute the phone call and other media. I was able to hang up on my phone and the main unit and it still acted like I was still on the phone with the main unit. The only way to end a call on the head unit was to restart it. You also cannot make calls from your contact list on the main unit, you still have to use your phone to do this. Although the main unit looks good and has many built-in and additional features, it didn't work properly for me. Maybe an update in the future can fix persistent issues, but I'll go back to the default device as it's much better in terms of stability and usability.
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