Samsung Galaxy S 4G User Manual page 182

Using the 3G Network
If you are using applications that require the 3G network speed,
follow these instructions to connect to the 3G network.
Press
1.
Wireless and network
mode.
Tap WCDMA only. A check mark displays next to this option
2.
to indicate that it is active.
Network Operators
Using this feature you can view the current network connection.
You can also scan and select a network operator manually, or set
the network selection to Automatic.
Press
1.
Wireless and networks
Tap Network operators. The current network connection
2.
displays at the bottom of the list.
Important!: You must deactivate data service prior to searching for an
available network.
Tap Search now to manually search for a network.
3.
177
and then tap (Settings)
Mobile networks Network
and then tap (Settings)
Mobile networks.
Tap Select automatically to automatically select a network
4.
connection.
Note: Connecting to 2G networks slows the data transfer speed and time.
Default Setup Options
Your phone default is set to Automatic (to automatically search
for an available network. You can set this option to Manual to
select a network each time you connect.
Press
1.
Wireless and networks
operators.
Tap Default setup.
2.
Tap Manual to locate and connect to a network manually,
3.
or tap Automatic to allow the device to automatically select
a network.
and then tap (Settings)
Mobile networks Network