N7000 wifi or data access can be used, and both can be selected normally. But why is it that sometimes both online ways are closed and data is automatically generated?

It's the software of your mobile phone. Just turn it off. But for a 3G mobile phone like N7000, some programs need to be updated, which will generate traffic. You can choose: set- wireless and network- mobile network, hook up the data inside, and will not automatically surf the internet. Of course, the networking programs in the mobile phone are all closed, for example, the weather forecast in the mobile phone will not be updated. If you want to use this network, you can open it, or you don't have to use another network.