Reference
Notes on Holding Your Tablet
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Some apps may not support screen rotation. Some apps may rotate the screen in reverse.
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Be careful not to hold or cover the antennas shown in the figure below while using the Wi-Fi, Bluetooth, GPS, or mobile communications functions.
SGPT12

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Wi-Fi / Bluetooth / GPS
SGPT13

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Wi-Fi / Bluetooth / GPS
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Mobile communications
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Do not put your fingernails in the accessory attachment slot or in the groove (shown below) when holding the tablet.

Note
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Some models are not available in some countries/regions.