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From skepticism to sustainability: changing perceptions of refurbished phones
(www.techradar.com)
Tip 1: Fairphones,Iphones,Pixels and Samsung phones are the best for long term software support.
Tip 2: Opt for a phone brand that is repairable and has a unlockable bootloader.
Tip 3: Install linux on your phone to keep getting software support.
Yeah, no security updates is a pity. I wish GrapheneOS would have extended support for older devices, but I guess it's a pain to maintain for them as well.