How to turn data services on and off on my BlackBerry Curve 9300

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Switch the network off so that the BlackBerry® smartphone will not transmit data without a Wi-Fi connection.
1. Press the Menu key.
2. Scroll to and select Manage Connections.
3. Scroll to and select Mobile Network Options.
4. Scroll to and select Data Services.
5. Select Off to turn data services off.
Note: the small data transfer indicators will change depending on whether data services are active.
6. Select Data Services again to turn data services on.