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I would rather have the same phone that I had 10 years ago if it meant that it would last 7 days with today's batteries

I have a feature phone, ironically lasts about 7 days. Recently purchased.

Have you tried turning off your screen, data connection, wifi, gps, bluetooth and NFC? 7 days of battery life is easy...

I haven't figured out how to use my phone with the screen off... what's the trick?