Samsung GALAXY S SGH-T989D - Manual (Page 178)

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Mobile networks
Before you use applications such as Google Maps and find your
location or search for places of interest, you must enable the
Mobile networks options.
ᮣ Press  and then tap (Settings) 
Wireless and network  Mobile networks.
The following options display:
Use packet data
Allows you to activate or deactivate data usage on your phone.
ᮣ
Press  and then tap (Settings) 
Wireless and network  Mobile networks 
Use packet data.
Data Roaming
Data roaming allows you to connect to your service provider’s
partner networks and access data services when you are out of
your service providers area of coverage.
1. Press  and then tap (Settings) 
Wireless and network  Mobile networks.
2. Tap Data roaming to allow/not allow connection to data
services while roaming outside your network.
A green
checkmark indicates the feature is enabled.
Access Point Names
ᮣ Press  and then tap (Settings) 
Wireless and network  Mobile networks  Access Point
Names. A list of the available wireless access points
displays. The active access point is indicated by a green
button to the right of the name.
Network mode
To configure your phone to automatically detect and use the
fastest possible data network connection:
1. Press  and then tap (Settings) 
Wireless and network  Mobile networks  Network Mode.
2. Tap GSM/WCDMA (Auto mode) to place a green button to
the right of the selection.
To limit the phone’s connection to (GSM) 2G, which slows data
transfer speed but extends battery life:
1. Press  and then tap (Settings) 
Wireless and network  Mobile networks  Network Mode.