I would be curious to try such a thing but how would one manage 2FA? I mean, so many things do require it and, well, not being an expert I'm not sure it can be installed used elsewhere than on a smartphone?
Simple Living
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Honestly, if I didn't need chat apps like Slack for my job I'd be pretty content with one of these. They'd still be good as secondary phones, but unless they can support chat apps (without other online apps like FB, IG, and even browsers - so good luck with that) they can't be my only/main device.
That is seen as a feature by many people. A big part of why a lot of people use a feature phone — whether for a short jaunt or for their main device — is to disconnect. You're still accessible by phone for important things, but you're no longer beholden to the constant buzz buzz buzz of chat notifications rolling in.