Samsung A640 - Manual (Page 105)

Section 2D: Controlling Your Roaming Experience 83
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Data Roaming
The data roaming option allows you to send and receive data
while you are out of your normal coverage area. All applicable
charges apply for accessing the available network.
To turn data roaming on or off:
1. Select Menu > Settings > Roaming > Data Roaming.
2. Highlight On or Off and press .