How to save Iphone 4S battery?

I always have a problem with my battery on my iphone. It always dies so fast! The only apps I really use and constanly go on is Instagram, my text messages, and my camera.that's all of the apps I use when I go out, and it still dies after four hours of being out. I need to know ways to keep a good battery life.

Make sure that your Wi-Fi and BLUETOOTH are turned off. Also make sure that you are getting a good signal from your service provider wherever you live. Otherwise the phone will do something called roaming which means that it is connecting from tower to tower without getting one strong signal. Follow these steps and that should improve your battery life. Oh and one more thing to mention make sure that the screen will dim shortly after left idle so that it doesn't use the battery quickly. Hope That This Will Help.

Umm… Maybe turn of your internet or Wi-Fi. Internet usually drains your battery. But I just can't help it! I love using the internet on my phone!

Easiest way is to reduce light and kill running applications.
reduce light in settings
kill apps by pulling up the menu by 2 or more fingers - I have ipad3, in ipad i do this with 4 fingers