Android Auto is supported on GrapheneOS: https://grapheneos.org/usage#android-auto https://grapheneos.org/usage#android-auto VoLTE and VoWiFi are supported if

Android Auto is supported on GrapheneOS: https://grapheneos.org/usage#android-auto https://grapheneos.org/usage#android-auto VoLTE and VoWiFi are supported if your carrier supports it. Google Maps and Uber work fine, provided you install sandboxed Google Play.