Sony SGPT21 - Manual (Page 25)

About the Wireless WAN
The wireless WAN (Wide Area Network) enables you to make a data communication with a device in much wider
area than Wi-Fi networks. You can connect to the Internet over mobile phone lines anytime and anywhere within
the wireless WAN area.
Note
The wireless WAN antenna is built in to your tablet device. If you cover the antenna with your hands or other
objects while connecting to the Internet using the wireless WAN function, the communications quality may
deteriorate [Details] .
When you are outside the wireless WAN area, you cannot connect to the Internet using the wireless WAN
function. Check the communications conditions, and move to the wireless WAN area.
In areas where wireless device use is prohibited, stop the wireless WAN communications function [Details] .