Samsung GALAXY S SGH-T989D - Manual (Page 174)

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use WPS, the connecting device must support WPS and be
compatible with Wi-Fi Protected Access (WPA) security. WPS can
automatically set up a random network name and WPA wireless
security for wireless Wi-Fi phones, routers, access points,
computers, adapters, and other electronic devices.
1. Press  and then tap (Settings) 
Wireless and network  Wi-Fi settings.
2. Tap WPS button connection.
3. Press the WPS button on your Wi-Fi access point within 2
minutes.
Add a Wi-Fi Network
To manually add a Wi-Fi network to the networks list:
1. Press  and then tap (Settings) 
Wireless and network  Wi-Fi settings.
2. Tap Wi-Fi to turn it on.
3. Tap Add Wi-Fi network.
4. Enter the SSID (Service Set Identifier) and Security settings
then tap Save.
Note: An SSID is a unique key that identifies a wireless LAN. Its purpose is to
stop other wireless equipment from accessing your LAN — whether
accidentally or intentionally. To communicate, wireless devices must be
configured with the same SSID.
Wi-Fi Direct Settings
Wi-Fi Direct allows Wi-Fi devices to talk to each other without the
need for wireless access points (hot spots).
Note: Activating this feature will disconnect your current Wi-Fi network
connection.
1. Press  and then tap (Settings) 
Wireless and network  Wi-Fi Direct settings.
2. Tap Wi-Fi Direct. A check mark displays next to the feature
indicating it is enabled. Your phone will search for other
devices enabled with Wi-Fi direct connections.
3. Tap a device name to begin the connection process.
Note: The target device must also have Wi-Fi Direct service activated and
running before it can be detected by your device.
4. Tap Connect. The direct connection is established.