What does 'Reset Statistics' mean? On iPhone 5?

Basically, need to know what it is.
Found on settings>mobile and it's at the bottom written in red. When I click it, it says 'do you want to reset your usage statistics'
But what does this do exactly? Will everything like my photos etc and contacts be wiped off the phone or?

The iPhone keeps statistics on how much data you download and upload so you can keep track of it. It helps for people who have capped data plans and don't want to go over, if you reset it, it just brings all the info back 0 for that month. Nothing important gets erased from your phone.

Erase All Content and Settings is what gets rid of everything!

It basically tells you how much data you've used on your phone. And when you reset it, it starts the count all over. It doesn't delete any apps or picture or anything like that. It simply resets the statistics of your data

Dose reset statics charge extra

Does or if you rest statics will you be paid extra

When you do it does it take away all the GB

When you do it does it take away all the GB

When you do it does it take away all the GB

When you do it does it take away all the GB

How can I reset data and start over

How do I find out how much time/dollars remain on my prepaid time?

Thank you SO MUCH