Hey there! I had the same issue with my iPhone 12, and I found a solution online. It turns out that sometimes the issue is caused by a problem with the cellular settings on your iPhone. To fix it, you need to reset your network settings. Try to reset all your network settings, including Wi-Fi passwords, Bluetooth connections, and cellular settings. After you reset your network settings, try setting up messaging on your car again.If it doesn't help, I've heard some people run tests on their phones by using an
Australian phone number to see whether the problem is with the phone or with the network provider.