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Smartphone manufacturers still want to make foldables a thing
(arstechnica.com)
This is a most excellent place for technology news and articles.
They make plenty of 'dumbphones'. They sell them at Walmart/Best Buy/Amazon so they're not exactly hard to find. If you don't want a smartphone why are you spending 10x the price of the thing you want?
Are you really having trouble with call quality? Unless I'm so far out in the sticks I don't have signal at all it hasn't been a noticeable consideration in years personally.