Samsung GH68-00422A - Manual (Page 106)

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Network Services
Preferred List: allows you to list your preferred
networks to be used when roaming. Your phone uses
the networks in order of appearance in this list,
provided that the network is available.
When you select this option, the current preferred
list is displayed if it already exists (see the procedure
below). Otherwise, the list of available networks is
displayed directly (see Step 2).
1. To... Then press the...
Scroll through Up/down navigation key.
the preferred list
Change an entry in Up/down navigation key to
the prefered list highlight the required entry,
followed by the Edit soft
key.
2. Select the network to be added to the list by
pressing the up/down navigation key until it is
highlighted, followed by Select.
The network is added to the list.