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If you touch the WPA2 PSK security option, a
password field is added to the Configure Wi-Fi
hotspot menu. If you enter a password, you will
need to enter that password when you connect
to the phone’s portable Wi-Fi hotspot with a
computer or other device. Or touch Open in
the Security menu to remove security from
your Wi-Fi network.
If you set the security option as Open, you can
not prevent unauthorized online use by other
people and additional charges can be incurred.
To avoid unauthorized use, it woud be best to set
a security option.