Why is the data usage on my iPhone so high?

I can't figure out what I'm doing that is causing it to be so high. I've compared to family members who seem to use the same if not more than I do. I frequently make sure I have Wi-Fi on hoping this'll reduce it?

Make sure to check if certain apps aren't using your data. It's possible they download images and videos etc… Like for example Youtube, it has a preload function which loads all of your subscription. Check in every app his settings if it's using it. Some apps have the option to turn this off.
Although there might be an option for this on iOS 7, but I'm not familiar with iPhone that much since I'm an android user.

Id recommand you to turn off the icloud service & other auto backup & sync apps or settings…

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