Support block updates via 3G

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http://androidforums.com – Hi I wonder if it is possible to block android updates via 3G and leave it alone for wifi, I have not seen this option to enable, in a galaxy instead note2, if you can select one or the other, how can the nexus? This morning I have downloaded via 3g and have used some 74MB, my bonus is limited data, is there option then prevent the download if you're not on a wifi network? En google play tengo marcado que se actualice bajo wifi, pero no parece que funcione sobre las actualizaciones del sistema thanks (General)