Encrypt anywhere. Talk over any channel
github.compreview
Kryptos is an end-to-end encryption app for iOS and Android that works through any messenger or SMS. You encrypt a message inside Kryptos (or on its keyboard), paste the resulting code into WhatsApp / Telegram / iMessage / Signal / VK / SMS / anything, and your correspondent decrypts it with Kryptos on their side. The messenger only ever carries what looks like random noise — the plaintext never touches it.

Here’s a good starting point, small list of a few items to do after flashing GOS.
What to Actually Do After Flashing:
franklinetech.com/first-24-hours-with-grapheneos/
Also look into private space, this allows you to run a “sub profile” in your main profile where you could install your already sandboxed Google play service as needed.
There are 3 main kinds of profiles:
Each have their own apps, app data, profile data including a home directory, their own disk encryption keys and their own VPN configuration.
Private Spaces and work profiles are similar to a user but nested inside of another user for actually usage them.