Mobile data use when turned off



2018-12-20 08:42

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Meizu M6 Note, Flyme

I turn mobile data off when I get to work, yet looking at my account history on my Telco website I see the phone is sometimes using mobile data.

The amount of data used varies between 2mb and 20mb. I am connected to wifi while at work.
Anyone has any idea as to why this is happening?