Samsung Galaxy SII User Manual page 246

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 main Settings page, 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.
3. Tap Search now to manually search for a network.
4. Tap Select automatically to automatically select a
network connection.
Note: Connecting to 2G networks slows the data transfer
speed and time.
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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 main Settings page, tap More settings
Mobile networks
2. Tap Default setup.
3. Tap Automatic to allow the device to automatically
select a network.
– or –
Tap Manual to locate and connect to a network
manually.
Network operators.