I got a new iphone 5s how do I turn off the data for when I'm not using it?

Ok so I used my data a lot yesterday and I used 104 mb but when I woke up I check after using my cell for a while and it's at 117 so how can I turn this off for when I don't have to use the data and when I have Wi-Fi ps I was using Wi-Fi this morning when it climbed

Go to setting and see data usage and turn off mobile data

Settings > Cellular > Cellular Data slider

Settings > Cellular > Cellular Data slider

Easy Way.
Settings>Mobile>Switch off the mobile data.

Settings > Cellular > Slide the Cellular Data to left