How to disable Mobile data on your Android:

 

Turn your device on and select Apps

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Now find Settings icon on the screen. It may be present on another page so just swap and look for it.

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Under settings, if you are running Android 4.3 or 4.2.2.

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Select Data Usage and un-tick Mobile Data.

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Now go back to previous screen and select  more Networks

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Under More Networks un tick Mobile data as shown below.

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Now your mobile data should be off