Samsung SGH-T989AABTMB - Manual (Page 206)

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Using the 4G Network
To confirm you are always using the fastest possible connection,
the phone has an automatic detection method where it finds both
the fastest and most stable connection/communication method.
This phone is capable of using either 4G/3G services for this
connection.
Note: WCDMA is only available on the 4G network.
1. Press ➔ and then tap (Settings) ➔
Wireless and network ➔ Mobile networks ➔ Network
Mode.
2. Tap GSM/WCDMA (auto mode). A check mark displays next
to this option to indicate that it is active. This is the default
mode for this phone.
Using the 2G (EDGE) Network
If you are not using applications that require the 3G network
speed (any application that accesses the network or uses a
browser), using the 2G network saves battery life.
1. Press ➔ and then tap (Settings) ➔
Wireless and network ➔ Mobile networks ➔ Network
mode.
2. Tap GSM only. A check mark displays next to this option to
indicate that it is active.
Note: Connecting to 2G networks slows the data transfer speed and time.
Using the 3G Network
If you are using applications that require the 3G network speed,
follow these instructions to connect to the 3G network.
1. Press ➔ and then tap (Settings) ➔
Wireless and network ➔ Mobile networks ➔ Network
mode.
2. Tap WCDMA only. A check mark displays next to this option
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.
1. Press ➔ and then tap (Settings) ➔
Wireless and network ➔ Mobile networks.
2. Tap Network operators. The current network connection
displays at the bottom of the list.