de-Google/de-Apple: Smartphone

Free and Open Source Software (FOSS) grants users the right to use, view, modify, and share it. This openness (versus closed source software) can result in greater benefits to accessibility, transparency, privacy, security, freedom, innovation, and sustainability.

The following are FOSS smartphone Operating Systems (OS) to replace Stock Android and iOS:

• GrapheneOS - Prioritizes security but limited device options
• LineageOS - 200+ devices supported (prioritizes device compatibility* and customization)
• e/OS - 250+ devices supported (prioritizes device compatibility* and a user-friendly, de-Googled experience)
• postmarketOS - 723+ devices supported (prioritizes longevity*, sustainability, and full device control)
• FairPhone - Repairable/ethical hardware

*Prioritizing compatibility and longevity extends the life of electronic devices = the most sustainable practice. A phone's manufacturing phase accounts for the majority of its carbon footprint and energy use.

de-Google/de-Apple: Density

Like a de-googled big bang, your expansion grows increasingly material.
By interacting intentionally with the internet and computer programs, your autonomous influence spreads naturally to hardware.

If you have an old unused phone, you can try installing a new operating system on it before installing on your main. This also gives you time to gradually learn the new setup, which may be a bit different to what you're used to. Open Source Software can greatly extend the lifespan of devices; an important reminder that the planned obsolescent timelines that Big Tech sells us are not real.