TBH I don’t remember if it was wired or wireless but my understanding is that GrapheneOS’s implementation is essentially the same as what is included on stock android for Pixels, so both wired and wireless work (https://grapheneos.org/usage#android-auto).

I used it with a stock system so not aftermarket. Do you have any specific reason to believe aftermarket systems wouldn’t work? If they support android auto you should be fine.

Banking apps yes

https://privsec.dev/posts/android/banking-applications-compatibility-with-grapheneos/

Phreeli is overpriced and doesn’t actually grant much privacy despite their claims. Telecom providers can still have a field day with your location and sms/call data even if Phreeli isn’t collecting that themselves, which is also really just a pinky promise at this point. There are also competing services already which don’t require PII either but have more reasonable prices.

If you want a phone number just to sign up for signal or something just use jmp.chat smspool or mysudo depending on your needs.

If I can answer any questions about GrapheneOS lmk. Android auto works, I don’t drive much but I’ve used it before. You can also ask on https://discuss.grapheneos.org/

/e/ OS is not more secure than lineage. It tends to lag behind on security updates by months.

https://eylenburg.github.io/android_comparison.htm

For privacy, security, and usability, GrapheneOS is the best alternative mobile os by far. The only downsides are if you don’t like or can’t afford Pixel phones, and even GrapheneOS won’t have certain features you may need such as mobile device management, google wallet nfc payments, certain apps especially banking apps.

finally made a lemmy account just to downvote you. don’t fucking do whippets they can paralyze you for life. I’ve seen it. And dentists use it because they have years of training and proper equipment and they understand the risks (unlike you clearly).