One of the biggest battery drains on the iPhone 4, iPhone 4S and the iPhone 3 series is the fast 3G internet access. Obviously, when you are out and about, you don't have much of a choice if you want fast internet access--but--if you are near a WiFi connection, use it! You will see a remarkable battery increase from using WiFi over 3G and it will remember every network you have joined in the past automatically!
Settings --> Wi-Fi --> Choose a network from the list
We prefer to turn off "Ask to Join Networks," since this just means there is one more thing on the phone that will just check indefinitely for new networks. If you are in a strange place, turn this on to see what types of networks are available, but, if you are in the same places you always go, turn it off.
Even better, on some of the iPhones, you can turn off 3G access in favor of Edge (slower network speed). This is also a big battery booster, but, you will be surfing and accessing the network much slower than true 3G:
Settings --> Network --> Enable 3g (turn this slider off if your phone supports this feature)
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