Why does my iPhone 4S drain extremely fast when 4G is turned on?

I always keep my 4G data off because if I leave it on, I'll lose a large percentage of my battery. Why is this? I use AT&T. How do I make my battery not drain? Its a huge difference between the rate my battery drains when you compare it to when I only have Wi-Fi on.

You've answered your own question. Turn off 4G when you have Wi-Fi.

I'm guessing are in areas where its always polling looking for 4G signals.

  • Why does my iphone 5s battery power drain so fast recently? So within the last 2 weeks I've been noticing that my battery power has been going down a lot faster than it normally did. In the past 5 minutes it went down by 5% and seems to be draining even when I turn it off. I haven't updated it at all and have only had it for 4 months. Does anybody know what's wrong?
  • Why does my iPhone 5s battery drain fast? Sometimes when I'm not using my phone it would be 96 % if it was at 100 % and I lock the phone and everything. also only when I'm using it just for music it'll also drain fast. Why does my phone battery drain fast? Is this normal? It also heats up. I'm wondering if I should take it to the apple store. What do you guys think I should do?
  • Why does my iphone 5 drain so fast? I do everything to help battery life and even turn on airplane mode, but in the morning it's 100% then I don't use it at all 1hout later boom 50 percent.
  • Why does my iPhone 5 battery drain fast? Ok, so, I charge my iPhone up to 100% battery, It's on the night, so I don't use it, I just unplug the iPhone after it's charged, and put it on my table, the next day in the morning, it drains to 98% or even less, I already turned off all the things that drain the battery, IOS 7.3 by the way. And umm, I turned off the parallex, app refresh, lower brightness, pretty much everything off/disabled, even Siri, Why does this happen?