How to turn app automatic downloads on/off on my Apple iPhone 6s

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To avoid unexpected data usage, you can stop apps from updating automatically. Switch cellular data off completely so that your Apple iPhone 6s will only update apps over Wi-Fi.
1. Touch Settings.
2. Scroll to and touch App and iTunes Stores.
3. Touch Updates to change the setting (e.g., from on to off).
4. Automatic updates are now off.
Touch Updates again to turn it on.
5. To switch data off completely so that your Apple iPhone 6s will only update apps over Wi-Fi, touch Use Cellular Data.
6. Data services are now off.
Touch Use Cellular Data again to turn data services on.