As Pan European says .. turn off the things your not using. If you think a 'dumb phone' will do what you want then turning off the 'smart phone' things like GPS, WiFi, Bluetooth and digital data to make it more like a 'dumb phone' should extend the battery life of your smart phone. You should also tun off any applications running in the background.
I've a galaxy S4mini .. in 2 days of connection to 2 cell networks but without data use the battery reduces to 50% of its capacity, very few calls. If I were to put it in aeroplane mode than it would further extend the battery life. And turning it off altogether should make it very battery friendly.
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