Hello, I am concerned about battery life on my ageing iPhone 3GS running the latest level of IOS 6 (IOS 7 does not work on the 3GS). I know that reducing screen brightness increases battery life. If I set screen curtain on does that have the same effect as setting screen brightness to 0? If I set brightness to say 40% and normally run with screen curtain on I can easily toggle screen curtain off to show the phone content to a sighted person. However if normally setting screen curtain on in this scenario does not improve battery life then there is no point in doing this. Instead I would have to run with screen brightness normally set to 0 and to remember to temporarily increase screen brightness to show the phone to a sighted person. Many thanks.
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