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Why can't we go back to small phones?
(www.spacebar.news)
This is a most excellent place for technology news and articles.
power usage of screens scales as O(n^2), but battery scales as O(n^3), meaning bigger phones will have better battery life
They can just make them a little thicker, but still usable with one hand.
Really, it's not a technical problem, it's a marketing problem (i.e. not enough demand, unfortunately).