How to turn data roaming and data services on/off on my Sony Xperia J

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When abroad, you need to turn on data roaming to use email, web browsing and other data services. Data roaming charges will apply.

To avoid unwanted roaming charges, you can turn off data roaming. You can also turn off mobile data altogether. This way, your Sony Xperia J will only connect to the Internet through Wi-Fi.
1. Touch Applications.
2. Touch Settings.
3. Touch More…
4. Touch Mobile networks.
5. Touch Data roaming.
6. Read the warning and touch OK.
7. Data roaming is turned on.
Touch Data roaming again to turn it off.
8. To switch the network off completely, touch Data enabled.
9. Data services are now off.
Touch Data enabled again to turn data services on.