How to turn data roaming and data services on/off on my LG Nexus 5

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When abroad, data roaming is required to use email, web browsing and other data services. Please note that data roaming charges will apply.

To avoid unwanted roaming charges, you can turn off data roaming. You can also turn off data services altogether. This way, your LG Nexus 5 will only transmit data over Wi-Fi.
1. Touch Apps.
2. Scroll to and touch Settings.
3. Touch More.
4. Touch Cellular networks.
5. Touch Data roaming to change the setting.
6. Read the warning and touch OK.
7. Data roaming is now on.
Touch Data roaming again to turn it off.
8. To completely turn off the network, touch Back.
9. Touch Back.
10. Touch Data usage.
11. Touch Cellular data.
12. Touch OK.
13. Cellular data is now turned off.