November 7th, 2011, 11:08 AM
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#4 (permalink)
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Join Date: May 2011
Location: Over there <points>
Posts: 4,669
Device(s): EVO 3D and Acer A500
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While I'm not sure about Sammy phones, I'd hope that they would be able to disable the mobile network without going into airplane mode. If you disable the mobile network connection, you won't use any data unless connected to wifi. If you absolutely need data, you can then re-enable it and do what you need to, then disable it again.
Also, turn off auto sync and background data when not connected to wifi.
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