How to turn data roaming and data services on/off on my HTC One

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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 HTC One will only transmit data over Wi-Fi.
1. Touch Applications.
2. Scroll to and touch Settings.
3. Touch Mobile data.
4. Touch Data roaming to change the setting.
5. Read the warning and touch OK.
6. Data roaming is now on.
Touch Data roaming again to turn it off.
7. To switch the network off completely, touch Back.
8. Touch the slider next to Mobile network.
9. Data services are now off.
Touch the slider next to Mobile network again to turn data services on.