Wonder if the same holds true for the whistleblower evidence now.
Get a carrier unlocked phone (buy direct from manufacturer) with unlocked bootloader and install third party OS.
CalyxOS for Pixel phones
https://calyxos.org/docs/guide/device-support/#supported-devices-still-receiving-updates-from-the-manufacturer
GrapheneOS for Pixel phones
https://grapheneos.org/faq#supported-devices
LineageOS for 60+ phones from various manufacturers
https://wiki.lineageos.org/devices/
Here's a good playlist to get you going.
https://www.youtube.com/watch?v=qhPe3rLEktE&list=PLR_ghQEN2SgBOLJaDomLoK95Ay_xV5aZV
That doesn't mean it's carrier and/or bootloader unlocked.
What model?
Settings About Phone > Model
Not really enough info Try clicking the red boxes as shown
How many heads on the beast from Revelation again?