LG Optimus G - Manual (Page 113)

Apps and Entertainment 105
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Office mode
You can select an application to run, and set whether to turn on/off Data network, Sound,
and Wi-Fi.
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Library mode
You can set whether to turn on/off Wi-Fi, Data network, Sound, and GPS.
3. Tap Write on NFC tag and tap the back of your phone to a tag or a phone to share.
Using Tag+ reading
Tap the NFC tag or NFC-enabled phone with the back of your phone. When tapping the set tag or a
phone, the preconfigured mode will be activated right away.
Note: Two tags come in the box. These tags are re-writable.