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I used to carry a Nokia 6310i with a new battery and it couldn't make it to a month without a charge. Maybe 2 weeks. My 235 4G can last about a week on standby. I'm not sure what the expectation is in the sort of places you're referring to, but I know some economically poorer regions are investing in 4G masts, like India thanks to Jio phones.

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As I recall, my old Nokia 1616-2 would last over 3 weeks between charges if not used. Only somewhat less if only used for texts, say 2.5 to 3 weeks.

It was actually making calls which cut in to the battery, but still it could last 7-10 days with the pattern of usage I had.

That is really what is needed for simple "feature phones"

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