A workshop about flashing lineageOS on a Samsung Galaxy S3.
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Setup a Google-Free mobile phone

Sources:

Research

Risks

Liberating your device from google voids the warranty.

If it fails and your backup does not work correctly, you risk that contacts or data are not available anymore.

If you have to use unofficial LineageOS or TWRP builds, because the device is not supported, the installation can fail. Then you'll have to flash the stock rom, and restore the backup. It's a nasty effort.

If you have to flash the stock rom, you can only login and use the phone, when you log into a Google account, that already was logged into the phone before you flashed it. Be wary if you bought the phone second hand/online.

Step By Step

Back up data before flashing

Install Firmware

Secure Phone

  • Encrypt phone
    • Load the battery to 100%
    • plug it into a charger
    • Start Encryption process: Settings/Security/Encrypt Phone
  • Install F-Droid
  • Install cryptfs
    • if necessary, root the device with magisk
  • wrong pin shutdown

Install apps

On F-Droid, you can get open source apps for almost any purpose. If you need Google Play Store apps, you can install them via the Aurora store. You can install the Aurora Store on F-Droid, too.

Some recommendations:

  • DAVdroid: sync Contacts & Calendar with ownCloud
  • Firefox Klar: private browser
  • OsmAnd~: offline maps with https://openstreetmap.org
  • Offi Stations: public transport connections. Different networks are available
  • Briar: End-to-End encrypted serverless Messenger
  • Conversations: End-to-End encrypted XMPP Messenger
  • DeltaChat: End-to-End encrypted E-Mail Messenger
  • ownCloud: store your data in a private cloud. Ask mailto:tech@lists.links-tech.org for an account

And if you really want proprietary shit software on your device: