Samsung SCH-I515MSAVZW User Manual
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Mobile network settings
Note that you can't adjust mobile network settings when Airplane mode is selected. The settings 
available may vary depending on your device and plan. 
G
Data enabled. Check to turn data access on for all available mobile networks.
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Before turning this option off, which may cause your device or apps to stop functioning correctly, 
consider using the mobile data limits available under Settings > Wireless & networks > Data 
usage.
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Data roaming. Prevents your device from transmitting data over other carriers' networks when you 
leave an area that is covered by your own carrier's networks. This is one way to to control expenses if 
your mobile data contract doesn't include data roaming. 
With Data roaming unchecked, you can still transmit data over Wi-Fi.
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Network mode. Allows you to choose between using both LTE and CDMA, or just CDMA.
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System select. Allows you to determine when roaming can occur over a CDMA network. With 
Home selected, you are restricted to your carrier's network for both voice and data. 
Related settings
Settings > Wireless & networks > Data usage
Settings > Wireless & networks > More > Airplane mode