What do I do to keep my iPhone from dying so fast?

What do I do to keep my iPhone from dying so fast?

Turn your apps off when you are done with them. Double click the big button. Your active apps should all be at the bottom of the screen. Hold your finger on one until a minus sign shows up on them all and they juggle. Touch the minus sign to shut them down. I'm assuming you are new to the iphone and don't know this. I've had friend in the same situation who had 20 or 30 apps running. If you shut them down, it will markedly increase the battery life.
If you know this, and regularly turn them off, you may have a faulty iPhone.

When I'm not using mine, I turn my brightness All THE Way down and turn off Wi-Fi and bluetooth.

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