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Two phones setup for longevity and privacy
Ive been using custom roms to greatly extend the lifespan of my phone (still using a xiaomi mi9t from 2019, running smoothly on A15, with lineageOS). Some apps, like banking apps, or gov apps sometimes require a stock android and locked bootloader. But, besides the stock spyware, stock roms become unusable in 2 to 3 years, forcing an upgrade.
Im thinking of getting a cheap 2nd phone to keep with stock android to use banking/gov apps and to leave at home. This way i could use my primary phone with a custom rom and have it working for way longer than 3 years, with less spyware, and wasting less money (depending on the price of that 2nd phone).
Does this seem like a decent strategy considering how android is moving?
Important question: If the cheap phone gets outdated, would it be safe to use it for banking considering i wouldnt install other apps or use a browser in that phone?
The brands available here (brazil) are mostly motorola, samsung, lg, xiaomi and realme (no pixels, no