Samsung SGH-T759ZPBTMB - Manual (Page 180)

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To secure the Mobile AP service:
The two most common methods for securing your connection to
the Hotspot are to a security method (WPA2 PSK) and to Hide
your phone’s SSID name.
1. Press ➔ and then tap (Settings) ➔
Wireless and network ➔ Tethering and portable hotspot ➔
Mobile AP settings ➔ Configure mobile AP.
2. Tap the Security field and select WPA2 PSK.
3. With security enabled, enter a new password into the
Password field.
Important!: The more complex the password, the harder it will be for
intruders to break your security. It is recommended that you not
use names, birthdays, or other personal information.
4. Tap Save to store the new settings.