Sony Xperia User Manual page 444

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Set other functions for wireless and networks. Settings can be made for the following items.
Airplane mode
Default SMS app
VPN
Mobile networks
NFC / Osaifu-Keitai settings
In Home Screen,
15
Item
(Settings)
Description
Disable all settings that emit signals. Handset
remains powered on.
For details, see "Using Airplane
Set default message application.
Add a VPN.
Set a network mode, etc.
Set NFC/Osaifu-Keitai
For details, see "Using NFC/Osaifu-Keitai
Mode."
®
settings.
®
."