Samsung Galaxy S III User Manual page 124

Access Point Names
To use Wi-Fi you need access to a wireless access point
(hotspot).
1. From the Connections menu, tap More settings
Mobile networks.
2. Tap Access Point Names.
A list of the Access Point names displays. The active
access point displays a green, filled circle to the right
of the name.
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.
1. From the Connections menu, tap More settings
Mobile networks.
2. Tap Network operators.
The current network connection displays at the bottom
of the list.
Important! You must deactivate data service prior to
searching for an available network.
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3. Tap Default setup, then select Automatic or Manual.
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.
1. From the Connections menu, tap More settings
Mobile networks.
2. Tap Network operators.
3. Tap Default setup.
4. Tap Manual to locate and connect to a network
manually, or tap Automatic to allow the device to
automatically select a network.